Database Info

[Q] Stuck y installing android

Hi,
I'm trying for 2 complete days to install android 2.2 on my polaris now but I cant get it working.
Since i'm a complete newby probably it will be something very simple (i hope) but i'm getting verry frustrated at the moment haha.
I'm stepping over from WM6.1
What i have done:
I have a HTC Polaris POLA100
I have a 4gb Micro sd HC class 4
I'm trying to install Incubus26Jc's Super FroYo RLS16 All Languages trough NAND
I have HARD SPL V2 on the phone
I have done all this steps: sourceforge. net/apps/ trac/androidhtc/wiki/HowToInstallWithAtoolsNand
When i boot my phone now i get:
linux logo in top: lots of text lines
then I get:
Mount: mounting /dev/block/mmcblk0p1 on/sdcard failed: invalid argument
sh: 0: unknown operand
found boot parameter for system
system on nand partition
found boot parameter for data
data on nand partition
failed
install module for this kernel
On the sd-card I have
POLAIMG.NBH
andboot
*androidupdate.TGZ
*androidinstall.TGZ
*install-seq.sh

I've tried the NAND option on this page also: http://forum.xda-developers.com/showthread.php?t=921053
But i get the massage:
failed
install module for this kernel

hooliead said:
I've tried the NAND option on this page also: http://forum.xda-developers.com/showthread.php?t=921053
But i get the massage:
failed
install module for this kernel
Click to expand...
Click to collapse
Download the modules form here:
http://sourceforge.net/projects/androidhtc/files/modules/
Rename the tgz file to "androidupdate.tgz" ,than put it in /sdcard/andboot/.install it when you enter the installer menu.Problem will be solved.

Same problems...
When i restart te phone with a soft reset and wait i will get the massage:
Failed
Install module for this kernel
When i manual try to install by keep pressing up the volume button after soft reset i get the massage
there is no such file on sdcard androidupdate.tar
I have checked several times there is a androidupdate.tar and a androidupdate.TGZ (same for androidinstall)
I also tried with only the .TGZ file and only the .TAR file

reformat the sd card.

done it several time... no succes

[Q] Starburst Data2SDInstallerX1.zip fails.

Hi
I haven't posted 10 times in XDA yet, so I cannot post this in the Starburst threat.
I have installed the Starburst 1.3.3.3 ROM and that went fine. My HTC Desire (PVT4, S-OFF, rooted) started up succesfully.
I then rebooted into recovery to flash the Data2SDInstallerX1.zip file to get Data2SD. I receive the following error message:
After the message "Verifying update package...." I receive the error "E: Missing File: META-INF/com/google/android/update-script"
As per the Starburst website, hereby the informattion. Help would be appreciated.
1.Size of sdcard used:
16Gb Transcent Class 6 card
2.Size of each partition created and type of partitions made (Fat32, Fat, ext2, ext3 or ext4), whether each partition was Primary or secondary
Both partitions are primary and MiB. The Ext4 partition is 1.95Gb, the remainder is FAT32
3.Software used for partitioning (Gparted, Amon Ra recovery etc)
Gparted from USB
4.Recovery Software installed, with version and subversion number (Eg: Clockworkmod 3.0.0 R3)
AmonRa 2.0.1
5.Whether you are S-OFF or S-ON (If you dont know what this is, or you dont have the picture of a Joker holding a card, on the bootup screen, you are S-ON)…………………………………….
S-OFF through AlphaRev 1.8
6.Detailed account of steps you did for the procedure, with output/errors at each step as received from the Recovery/Partitioning software…………………………………….
After installing the Starburst ROM and starting Android for the first time, I want to install Data2SD. I use the Data2SDInstallX1.zip file.
I receive an error message saying a file cannot be found (see 12)
7.Did you do a full wipe from Recovery before installation?
Yes, I chose "Wipe" in AmronRa
8.If you didnt, what ROM were you running previously?
Stock. This is my first time.
9.Version of the ROM you installed, and the names of the Data2SD installer/reinstaller flashable zips you used…………………………………….
Installed Starburst Lite 1.3.3.3
10.If you’re using a custom kernel, full name of the kernel with author name, the kernel voltage if known, whether you have an overclocked/undervolted configuration…………………………………….
Using the Kernal that comes with Starburst Lite 1.3.3.3
11.Did you get any of the following messages in recovery? …………………………………….
1.sd-ext could not be formatted, file already exists?
2.Failure mounting ‘sd-ext’
3.Or a message similiar to the above?
Nope.
12.Step at which major error was noticed…………………………………….
a) Boot to recovery
b) Flash ZIP from SD Card
c) Choose Data2SDInstallerX1.zip
d) After the message "Verifying update package...." I receive the error "E: Missing File: META-INF/com/google/android/update-script"
13.Recovery log as per the procedure detailed initially……………………………………..
See attached
14.Any additional info you think is relevant…………………………………….
None

And the attachment...
I forgot to attach the recovery log in the previous post.

Found it
I found the solution.
Signature off is not the same as S-OFF
Go into recovery and in AmronRa, go to 'Other'. It is the third uption. Ensure the signature check is off. Then flash the ZIP.
You're in.

[mod][tool]dual boot for zte blade/modify-tool

Hello guys. This my dual booting project for our amazing ZTE BLADE!
What is this?
>This mod works on the basis of two scripts which are to be executed in the terminal emulator or script manager and a modified boot.img to boot the rom from sdcard instead of NAND.
FOR ADVANCED USERS ONLY!!!
I WILL NOT BE RESPONSIBLE FOR ANY BRICKED DEVICES, DAMAGED SDCARDS ETC.
DO IT AT YOUR OWN RISK!!!
It is in alpha stage, so lot of work is still needed to make it more safer and convenient.
I will add this mod for more ROMS like CM10, Paranoidandroid etc.
Downloads:
Cyanogenmod9(KonstaKang)
Boot.img - Download
Updater-script - Download
Cyanogenmod10
Boot.img - Download
Updater-script - Download
Gapps::
Jelly Bean Gapps Updater-script - Download
Tool:
Modify-Boot - Download
Now no need to wait for me to mod your boot.img.Mod your boot image for dual boot with this tool!!!
Guide for the tools is on the second post.
Thanks go to:
Sulthekk for guiding me towards right way.
SNAP.iT for giving me some mounting ideas.
All the people who have helped me(can't remember all names ).
And the big community to test it for me.
SCROLL DOWN to 2nd POST FOR THE WHOLE GUIDE...

GUIDE
So here is the full guide:
PARTITIONING SD CARD TO MOUNT /SYSTEM AND /DATA
Take the backup of your sd card data first
Make sure you have partitioned your sdcard before.
Connect your phone to your computer and mount usb storage.
Download the EASEUS partition manager from here.
Open partition manager and delete all partitions of your sdcard.
Right click on the 'unallocated' and click create partition.Don't label it select partition type as primary and filesystem as FAT32 and enter the partition size bot remember this will hold your photos,media etc,you should leave about 600 mb space free click OK.
right click again and create partition as primary and filesystem as EXT3 and size of 250 mb click OK.
Repeat above step again.
Apply all the changes by cliking on apply tap and you have succesfully partitioned your sdcard for dual booting.
​
GUIDE FOR THE TOOL
Extract the downloaded zip file extract to any concinient directory.Here I will explain the guide as a cygwin user.
Extract the zip to directory say c:\
The extracted folder will look like 'Modify-boot".Now open the terminal or cygwin bash and mount the directory by typing
cd c:\modify-boot
Click to expand...
Click to collapse
Now drop your boot.img in the WORKING_313 folder and execute the script by typing
./modify-boot.txt
Click to expand...
Click to collapse
It will mod your boot.img for dual booting.Output boot.img will be in the WORKING_313 folder as boot.img.
MODDING THE ROM FOR DUAL BOOTING
Open the ROM.zip.
Get the modded boot.img from the tool and replace with the original one.
Now download the attached updater-script from 1st post and replace the orignal one with this modded one(path to udater-script META-INF/com/google/android).
Zip up the rom.
ADAPTING A ROM TO INSTALL IN THE SD CARD
If you want to mod your own rom other than the posted here,then you have to mod the updater-script in the rom
For that open your rom zip go to /META-INF/com/google/android and open the updater script
Now replace every line looking like following as;
From
mount("yaffs2", "MTD", "system", "/system");
Click to expand...
Click to collapse
TO
run_program("/sbin/mount", "dev/block/mmcblk0p3", "/system");
Click to expand...
Click to collapse
and this one
From
format("yaffs2", "MTD", "system", "0");
Click to expand...
Click to collapse
TO
run_program("/sbin/mkfs.ext2", "dev/block/mmcblk0p3");
Click to expand...
Click to collapse
and add the following line next to the line written above
run_program("/sbin/mkfs.ext2", "dev/block/mmcblk0p2");
Click to expand...
Click to collapse
Save the file and zip up the rom.Your rom is ready to install to SD CARD!!!!
FLASHING GUIDE
Remember, before partitioning the sd card you should wipe data and cache in the recovery during NAND rom installation or it will erase the partitions created before.
First flash the rom you want to install in the NAND,do not wipe data or anything do it before partitioning.
Then install the rom without wiping data or anything.
reboot the system. You will be in your sd card rom!!!
Now create folder in the sd card as /sdcard/multiboot.
Take both boot.img from NAND rom and cm9 rom rename the cm9 boot.img to bootsd.img and keep the NAND boot.img as it is.
Copy both imgs to multiboot folder.
Now download attached(or use above link for unregistered users) bootnand.sh and bootsd.sh and place at the root of the sdcard.
Open terminal emulator,type su and execute bootsd.sh to boot into sd card rom or execute bootnand.sh to boot into NAND rom.
THAT'S IT . ENJOY DUAL BOOT ON YOUR ZTE BLADE!!!!

[email protected] said:
So here is the full guide:
PARTITIONING SD CARD TO MOUNT /SYSTEM AND /DATA
Take the backup of your sd card data first
Make sure you have partitioned your sdcard before.
Connect your phone to your computer and mount usb storage.
Download the EASEUS partition manager from here.
Open partition manager and delete all partitions of your sdcard.
Right click on the 'unallocated' and click create partition.Don't label it select partition type as primary and filesystem as FAT32 and enter the partition size bot remember this will hold your photos,media etc,you should leave about 600 mb space free click OK.
right click again and create partition as primary and filesystem as EXT3 and size of 250 mb click OK.
Repeat above step again.
Apply all the changes by cliking on apply tap and you have succesfully partitioned your sdcard for dual booting.
​
MODDING THE CM9 ROM FOR DUAL BOOTING
Open the konstakang.zip (currently only supported rom, will add more soon).
Download modded boot.img from here extract it and rename the .img file to boot.img.
Delete the boot.img from the cm9 rom and put the downloaded one.
Now download the attached updater-script (remove .txt) or from here (for unregistered users)and replace the orignal one with this modded one(path to udater-script META-INF/com/google/android).
Zip up the rom.
FLASHING GUIDE
Remember, before partitioning the sd card you should wipe data and cache in the recovery during NAND rom installation or it will erase the partitions created before.
First flash the rom you want to install in the NAND,do not wipe data or anything do it before partitioning.
Then install the cm9 rom without wiping data or anything.
reboot the system. You will be in your sd card rom!!!
Now create folder in the sd card as /sdcard/multiboot.
Take both boot.img from NAND rom and cm9 rom rename the cm9 boot.img to bootsd.img and keep the NAND boot.img as it is.
Copy both imgs to multiboot folder.
Now download attached(or use above link for unregistered users) bootnand.sh and bootsd.sh and place at the root of the sdcard.
Open terminal emulator,type su and execute bootsd.sh to boot into sd card rom or execute bootnand.sh to boot into NAND rom.
THAT'S IT . ENJOY DUAL BOOT ON YOUR ZTE BLADE!!!!
Click to expand...
Click to collapse
hi, thank u ....... the link for 'boot.img' is not working. Pls fix it

Can't thank you enough for this,if it works.. Great stuff btw.. At least,you were the first one that tried and got it working..
Sent from my LT26i using xda premium

karthiknr said:
Can't thank you enough for this,if it works.. Great stuff btw.. At least,you were the first one that tried and got it working..
Sent from my LT26i using xda premium
Click to expand...
Click to collapse
+1
We've been waiting on this ever since karthik and wbaws discussion made it sound impossible

Just reported as a news tip for the portal

Thanks!!

New update coming for tool soon!!!

Its a great achievement .. future updates will be easy to go on for basic user. Btw thanks man. .
Sent from my Blade using Tapatalk 2

I've found that making four partitions and installing /data to mmcblk0p4 and /system to mmcblk0p3 helps with certain roms that have S2E configured.
I'm also trying to get it to boot two mounted loop filesystems instead, i installed SSRLS7 and GB-Gapps as per your instructions in the OP (just changed the partitions for installation and the updater-script and init.rc so that it would work) did a dd of the entire partitions to files on the sdcard and edited the init.rc like this:
Code:
on fs
# mount mtd partitions
chmod 777 /sbin/busybox
symlink /sbin/busybox /sbin/losetup
mount vfat /dev/block/mmcblk0p1 /mnt/sdcard
losetup /dev/block/loop0 /mnt/sdcard/multiboot/snow/system.img
losetup /dev/block/loop1 /mnt/sdcard/multiboot/snow/data.img
mount ext2 /dev/block/loop0 /system
mount ext2 /dev/block/loop1 /data
mount yaffs2 [email protected] /cache nosuid nodev
on post-fs
# ZTE_JCD_CTSCONFIG, 2011.05.03, BEGIN
mkdir /system/lost+found 0770
chmod 0770 /system/lost+found
# ZTE_JCD_CTSCONFIG 2011.05.03, END
# once system is setup, no need to modify /system , ZTE_BOOT_LIWEI_20110331
mount ext2 /dev/block/loop0 /system ro remount
I also copied busybox to /sbin in the ramdisk before letting the process finish and make bootsd.img
It doesn't work though and i have no idea why not. I've mounted the system.img and data.img files on the phone via the terminal to test if the procedure works and it does mount them just fine.
If anyone has any clue why this doesn't work then please tell me.

Dual boot on ideos x6
[email protected] said:
hello guys. This my dual booting project for our amazing zte blade!
What is this?
>this mod works on the basis of two scripts which are to be executed in the terminal emulator or script manager and a modified boot.img to boot the rom from sdcard instead of nand.
For advanced users only!!!
I will not be responsible for any bricked devices, damaged sdcards etc.
Do it at your own risk!!!
It is in alpha stage, so lot of work is still needed to make it more safer and convenient.
I will add this mod for more roms like cm10, paranoidandroid etc.
Downloads:
cyanogenmod9(konstakang)
boot.img - download
updater-script - download
cyanogenmod10
boot.img - download
updater-script - download
gapps::
Jelly bean gapps updater-script - download
tool:
Modify-boot - download
now no need to wait for me to mod your boot.img.mod your boot image for dual boot with this tool!!!
Guide for the tools is on the second post.
Thanks go to:
Sulthekk for guiding me towards right way.
Snap.it for giving me some mounting ideas.
All the people who have helped me(can't remember all names ).
And the big community to test it for me.
Scroll down to 2nd post for the whole guide...
Click to expand...
Click to collapse
dear friends is it possible on huawei ideos x6?
Plz reply

vimi93 said:
dear friends is it possible on huawei ideos x6?
Plz reply
Click to expand...
Click to collapse
Seriously? Dude can't u see this is the Blade forum. It will not work on any other phones

QuantumFoam said:
Seriously? Dude can't u see this is the Blade forum. It will not work on any other phones
Click to expand...
Click to collapse
Actually, it'll work on any phone that runs android and has a working recovery that can be used to install boot.img and system files via an updater script.
It works fine on my Mini and Huawai G300.

Jinxxed said:
Actually, it'll work on any phone that runs android and has a working recovery that can be used to install boot.img and system files via an updater script.
It works fine on my Mini and Huawai G300.
Click to expand...
Click to collapse
I stand corrected.
---------- Post added at 01:42 AM ---------- Previous post was at 01:37 AM ----------
Oh and btw, [email protected], check the xda portal. You're on the front page.
Congratulations

Jinxxed said:
Actually, it'll work on any phone that runs android and has a working recovery that can be used to install boot.img and system files via an updater script.
It works fine on my Mini and Huawai G300.
Click to expand...
Click to collapse
Will try it out on my LG P500 then!

thanks
Jinxxed said:
Actually, it'll work on any phone that runs android and has a working recovery that can be used to install boot.img and system files via an updater script.
It works fine on my Mini and Huawai G300.
Click to expand...
Click to collapse
thank you for the reply

How to fix 'E: Can't Mount Cache' in CWM

This happens when you wipe the cache, but it does not mean anything is wrong with your phone.
E: Can't mount /cache/recovery/log and the other five errors are similar to this.
PERFORM A BACKUP PRIOR TO THIS
I AM NOT RESPONSIBLE FOR ANYTHING THAT HAPPENS TO YOUR PHONE.
Start by going into your recovery..
If you want to keep the ROM you have, then follow these directions. When flashing a new ROM follow the next set of directions.
KEEPING YOUR CURRENT ROM
1) Go into your recovery
2) Go to mounts and storage
3) Format /cache x3
4) Go to advanced in the main menu
5) Reboot recovery
If it is not working, repeat the steps.
FLASHING A NEW ROM
1) Go into your recovery
2) Format /system /data /cache x3 (Like any normal flashing of a ROM)
3) Install the ROM you want to use
4) Go to mounts and storage
5) Format /cache
6) Go to advanced in the main menu
7) Reboot recovery
8) Boot into your newly flashed ROM
I made this thread because some people still have this error show up even though it doesn't affect the way you flash a ROM.. It's just annoying to see that come up every time you hit the back button in CWM.

syedwaseem said:
This happens when you wipe the cache, but it does not mean anything is wrong with your phone.
E: Can't mount /cache/recovery/log and the other five errors are similar to this.
PERFORM A BACKUP PRIOR TO THIS
I AM NOT RESPONSIBLE FOR ANYTHING THAT HAPPENS TO YOUR PHONE.
Start by going into your recovery..
If you want to keep the ROM you have, then follow these directions. When flashing a new ROM follow the next set of directions.
KEEPING YOUR CURRENT ROM
1) Go into your recovery
2) Go to mounts and storage
3) Format /cache x3
4) Go to advanced in the main menu
5) Reboot recovery
If it is not working, repeat the steps.
FLASHING A NEW ROM
1) Go into your recovery
2) Format /system /data /cache x3 (Like any normal flashing of a ROM)
3) Install the ROM you want to use
4) Go to mounts and storage
5) Format /cache
6) Go to advanced in the main menu
7) Reboot recovery
8) Boot into your newly flashed ROM
I made this thread because some people still have this error show up even though it doesn't affect the way you flash a ROM.. It's just annoying to see that come up every time you hit the back button in CWM.
Click to expand...
Click to collapse
I have tried this but this does not work. I am Using PhilZ CWM 6.49.2. I cant even Flash A Custom ROM Because of this problem it would just show me these error messages and say "Installation Aborted" and restart phone.
I have also Flashed back the Stock ROM and repeated all of the procedures: 1.Framaroot 2:CWM
Still no success it just keeps giving me these stupid errors, Please Find a FIX.
THANKS

dima234 said:
I have tried this but this does not work. I am Using PhilZ CWM 6.49.2. I cant even Flash A Custom ROM Because of this problem it would just show me these error messages and say "Installation Aborted" and restart phone.
I have also Flashed back the Stock ROM and repeated all of the procedures: 1.Framaroot 2:CWM
Still no success it just keeps giving me these stupid errors, Please Find a FIX.
THANKS
Click to expand...
Click to collapse
I have the same problem.
I tried methods:
$ su
#dd if = / sdcard / recovery.img of = / dev / block / mmcblk0p13
It does not work.
I installed the stock rom and checked the partition mmcblk0p13 with "Partition Table" and the partition is not mounted.
Maybe this is the problem?

meriox said:
I have the same problem.
I tried methods:
$ su
#dd if = / sdcard / recovery.img of = / dev / block / mmcblk0p13
It does not work.
I installed the stock rom and checked the partition mmcblk0p13 with "Partition Table" and the partition is not mounted.
Maybe this is the problem?
Click to expand...
Click to collapse
Yea even i have tried the same but it does not work, guess we have to stick to the stock ROM till someone finds a fix.

dima234 said:
Yea even i have tried the same but it does not work, guess we have to stick to the stock ROM till someone finds a fix.
Click to expand...
Click to collapse
Do you think that someone will be looking to solve the problem?
It seems to me that the problem occurs only in the new models that have been bought recently.
I tried to install the older stock firmware but it did not help.
None of the methods that have been on the forum does not work.
The problem occurs only when WIPE DATA / FACTORY RESET.

meriox said:
Do you think that someone will be looking to solve the problem?
It seems to me that the problem occurs only in the new models that have been bought recently.
I tried to install the older stock firmware but it did not help.
None of the methods that have been on the forum does not work.
The problem occurs only when WIPE DATA / FACTORY RESET.
Click to expand...
Click to collapse
yea getting the same problem here.
cant mount system
cant mount cache
and most of all when install custom ROM. cannot continue since non of those partitions cannot mount properly.
and other errors are flooding the recovery, we have tried Philz, CWM, TWRP. same annoying problems.

Hello,
On another website I found this:
"All worked fine but that like of command in terminal you put there isn't right, i did this
$ su [and then enter]
# dd if=/sdcard/recovery.img of=/dev/block/mmcblk0p32 [and then enter]
# reboot recovery [and then enter]
PS: the $ comes automatically when you start the terminal emulator app; the # comes automatically after you allow the super user [in $ su]
Do consider all the "Spaces" between symbols and paths!"
Has anyone used this method?

syedwaseem said:
This happens when you wipe the cache, but it does not mean anything is wrong with your phone.
E: Can't mount /cache/recovery/log and the other five errors are similar to this.
PERFORM A BACKUP PRIOR TO THIS
I AM NOT RESPONSIBLE FOR ANYTHING THAT HAPPENS TO YOUR PHONE.
Start by going into your recovery..
If you want to keep the ROM you have, then follow these directions. When flashing a new ROM follow the next set of directions.
KEEPING YOUR CURRENT ROM
1) Go into your recovery
2) Go to mounts and storage
3) Format /cache x3
4) Go to advanced in the main menu
5) Reboot recovery
If it is not working, repeat the steps.
FLASHING A NEW ROM
1) Go into your recovery
2) Format /system /data /cache x3 (Like any normal flashing of a ROM)
3) Install the ROM you want to use
4) Go to mounts and storage
5) Format /cache
6) Go to advanced in the main menu
7) Reboot recovery
8) Boot into your newly flashed ROM
I made this thread because some people still have this error show up even though it doesn't affect the way you flash a ROM.. It's just annoying to see that come up every time you hit the back button in CWM.
Click to expand...
Click to collapse
Thanks worked for me :good:

bricked
I've got these errors on my htc desire x, I made a backup, after that, I try to flash a new rom, with the steps written in the first post. The result was: after the htc logo, it showed a black screen! I try to restore the backup, but I cant restore!!!!! I've got soft brick, so I take it a service. I hope, they can fix it

[DUAL_BOOT][ANY_ANDROID]Dual booting in an android phone with external SD card

So here you come. To read and perform this tutorial, you obviously need a first hand experience on flashing a ROM and/or kernels. Otherwise this tutorial and my efforts to get you a device with two OSes running might end up giving you a bricked device. So, if you're hearing the terms "flashing" or 'kernels' for the first time and thinking it's kinda good food, then bro, just go and taste those first.
Something's to remind before we gonna dig deep into this tutorial->
Noone but you will be responsible for what you end up with.
The warranty of your device will be voided after this if it isn't already after rooting. For MI users, the good news is that you can reclaim it by just flashing the fastboot ROM for your device.
Enough lectures. Bro let's get to work.
Things you'll be needing =>
One working Windows PC(because I doesn't know any replacement of bootimg.exe on any other OS. If you know, then let me).
ADB, fastboot and the device drivers (easily found in XDA)
Any custom CWM based recovery installed.(since TWRP is most popular, I will demonstrate using it. You can use any other you want overall process will be the same)
A custom ROM and kernel for your phone(the second os)
A class 10 memory card ( I recommend 32GB for the spaces)
PART 1: MODIFYING THE BOOT
At first, how does your device boots up? What are the partitions called /data and /system? The answer is quite simple. It's your kernel that points out the location from where the OS should be picked up. So for booting into the second OS we need some modifications to it at first.
Search and download bootimg.exe on XDA, I'll post a link later. Create two folders. Name them "Internal OS" and "External OS" respectively. Put the zip file of the OS you're currently using to the first one and the OS you're gonna use on the external storage to the second one. Rename the second OS to originalExternalOS.zip. Extract originalExternalOS.zip. Pick the boot.img file from the root of the extracted folder and move it to a new folder named "boot2". Extract the IMG using bootimg.exe. Navigate to the initrd folder and you will get a file named 'fstab".
Basically it's the file that tells the kernel which partition does the OS resides in.
Open the file in your favourite text editor.
Replace every instance of the first line with the second one:
/dev/block/bootdevice/by-name/system => /dev/block/mmcblk1p2
/dev/block/bootdevice/by-name/userdata => /dev/block/mmcblk1p3
/dev/block/bootdevice/by-name/cache => /dev/block/mmcblk1p4
Save the file without giving any extension to it. Repack it using the same tool. You'll have boot-new.img and boot-old.img. Rename boot-new.img to boot.img and replace the one in the root folder with this. Basically what we're doing here is replacing the old boot.img with the modified one.
For your knowledge, blocks are the partitions of any storage you have on your device. For example, your internal storage is partitioned to near about 30 different blocks each starting with prefix "mmcblk0p". We here just told the kernel to load the OS from the blocks mentioned. We'll be creating these blocks in the external SD card next.
PART 2: PARTITIONING THE SD CARD
Connect your device with the memory card inserted to your PC. If you haven't installed fastboot, ADB, and the drivers, do it now.
READ THE FOLLOWING CAREFULLY
Reboot the device to recovery mode. Type the commands in cmd:
Code:
adb shell
parted
unit MB
print
quit
umount external_sd
Read and store the minimum and maximum capacity of your card. Since different cards will have different capacities I will point it as variable MIN_SIZE and MAX_SIZE. You'll need to calculate and put the values in the commands. Now type the following commands on cmd:
Code:
parted /dev/block/mmcblk1
rm 1
//START_BLOCK = MAX_SIZE - 5000
mkpartfs primary fat32 MIN_SIZE START_BLOCK
//SYS_START = START_BLOCK+1
//SYS_END = SYS_START + 1200
mkpartfs primary ext2 SYS_START SYS_END
//DATA_START = SYS_END+1
//DATA_END = DATA_START + 3500
mkpartfs primary ext2 DATA_START DATA_END
//CACHE_START = DATA_END + 1
mkpartfs primary ext2 CACHE_START MAX_SIZE
//We have partitioned the memory card. Let's format them. Ignore all "Do you wish to continue" question in the next commands as we're already mentioning yes.
mkfs yes 1 fat32
mkfs yes 2 ext2
mkfs yes 3 ext2
mkfs yes 4 ext2
quit
//Now they are almost ready. Just make the newly created blocks readable by the OS.
make_ext4fs /dev/block/mmcblk1p2
make_ext4fs /dev/block/mmcblk1p3
make_ext4fs /dev/block/mmcblk1p4
//Now you get where does the blocks come in the kernel right?
exit
//You've covered up the hardest part. Let's get some coffee.
PART 3: MODIFYING THE NEW OS
You've left the OS extracted in the "External OS" folder right? It's time to do some magic in it. We're gonna tell the OS to be installed in the blocks we created just like the kernel. But wait, where does the OS know before installing where it should get installed? Well, the answer hides in the updater-script in the folder META-INF > com > google > android. Navigate yourself in it. Open the updater-script file in your favourite editor ( I use notepad++ ) and modify it in the same way as the boot.
Replace every instance of the first line with the second one:
/dev/block/bootdevice/by-name/system => /dev/block/mmcblk1p2
/dev/block/bootdevice/by-name/userdata => /dev/block/mmcblk1p3
Leave the /dev/block/bootdevice/by-name/boot as it's the fundamental block and we can't replicate it. Don't think for the /cache partition as we've already done that in the boot.img file. Now navigate to the root of the folder where you extracted the External OS. Select all files, add them to a zip file using WinRAR. Name the file to newOS.zip. Open newOs.zip and originalExternalOS.zip with WinRAR and compare them if you find any change in the folder tree. They must and they should be exactly the same. You're 80% done.
PART 4: MODIFYING THE RECOVERY
We often flash many zips including very popular Xposed and other mods to our OS right? They also look for the /system partition. So what are we gonna do? Modifying each of them? Nah. Let's modify where they get which one the /system is. The recovery. Extract the img of the recovery you're using with the same bootimg.exe. Modify exactly the same things. I.e.
Replace every instance of the first line with the second one:
/dev/block/bootdevice/by-name/system => /dev/block/mmcblk1p2
/dev/block/bootdevice/by-name/userdata => /dev/block/mmcblk1p3
/dev/block/bootdevice/by-name/cache => /dev/block/mmcblk1p4
in the following files : initrd/fstab.qcom
initrd/etc/recovery.fstab
initrd/etc/twrp.fstab(For TWRP only)
Save them. Repack. And you got your recovery-new.img and recovery-old.img. Put recovery-new.img and newOS.zip in the same folder. Now wake up, it's time for some action.
PART 5 : INSTALLING THE OS
Open cmd in the folder where newOS.zip resides. Reboot the device in fastboot mode. Type the following commands:
Code:
adb push newOS.zip external_sd
fastboot flash recovery recovery-new.img
fastboot boot recovery
Now your device should boot up in recovery mode. To check if everything has gone fine mount system using TWRP. Use twrp's built in file manager and navigate to system folder. It's empty? Yup. You've done a great job. Now flash the newOS.zip using TWRP and your device should boot up in the new OS. To cross check again remove the SD card and try to boot. If you're headed towards recovery or bootloop after that then it's a win. Put the SD card back again and watch the new OS to boot.
PART 6: SWITCHING BETWEEN THE TWO
Extract the boot.img from the "Internal OS" zip file and put it together with recovery-old.img. To check if your old system is untouched type the following commands in fastboot mode:
Code:
fastboot flash recovery recovery-old.img
fastboot flash boot boot.img
fastboot boot system
Your device should take you back to the old one. Surprised? Now let's make a switch between the two. There are two methods.
METHOD 1: USING FLASHIFY
Create two folders in your SD card. Put boot.img and recovery-old.img to one and boot-new.img and recovery-new.img to the other. To switch to the external OS, just flash boot-new.img as boot and recovery-new.img using flashify. Ignore reboot now dialog and reboot directly to the system. To go back, first install flashify in the new OS and flash boot.img and recovery-old.img. Easy right?
METHOD 2: USING ZIPS
I'm gonna tell you that tomorrow as I can write no more today.
More to come....
CREDITS:
justzzshadz from MIUI forum for this revolutionary concept. @iamsubhranil for adding TWRP, Flashify support and completely rewriting the tutorial.

Thank u so much for ur efforts... It helps me a lot
I don't understand members on xda ...why they don't give thnaks on thread ..they only see the thread and go away...
Sry 4 my english ..
Thanks again
---------- Post added at 08:07 AM ---------- Previous post was at 07:48 AM ----------
Pls lemme know that if i can use dsixda's kitchen for modifying boot.img (kernal ) ???
Coz i didn't find bootimg.exe tool... If u have then pls give me the link.
Thanks

yes you can use android kitchen

When You Will Continue Writing The Thread Im Really Interested in trying it

Faisal Z Ahmad said:
When You Will Continue Writing The Thread Im Really Interested in trying it
Click to expand...
Click to collapse
I will after a while as I'm having final exams you can still try with flashify bro

sc123001.11 said:
Thank u so much for ur efforts... It helps me a lot
I don't understand members on xda ...why they don't give thnaks on thread ..they only see the thread and go away...
Sry 4 my english ..
Thanks again
---------- Post added at 08:07 AM ---------- Previous post was at 07:48 AM ----------
Pls lemme know that if i can use dsixda's kitchen for modifying boot.img (kernal ) ???
Coz i didn't find bootimg.exe tool... If u have then pls give me the link.
Thanks
Click to expand...
Click to collapse
http://forum.xda-developers.com/redmi-1s/general/guide-unpack-repack-kernel-t2908458
Most comfortable

iamsubhranil said:
I will after a while as I'm having final exams you can still try with flashify bro
Click to expand...
Click to collapse
Yeah I Know I Can Try But i Need To Know Method 2 To Switch ROMS Because Second One Is Faster Using Zips Otherwise Great Post And Guide ,Thank You
Good Luck With Your Exams

Nice tutorial.
Dual boot for Mediatek devices is so easy to me. But I don't have any idea for Other devices like Samsung or Sony.
When I bought some SD Card, I'll try this one.
Keep it up!

Faisal Z Ahmad said:
Yeah I Know I Can Try But i Need To Know Method 2 To Switch ROMS Because Second One Is Faster Using Zips Otherwise Great Post And Guide ,Thank You
Good Luck With Your Exams
Click to expand...
Click to collapse
Thanx a lot
BTW flashify is also very convenient method
1)Just choose boot image from the option
2)Find and select the internal or external boot image to boot
3)Have a normal reboot

jbliz said:
Nice tutorial.
Dual boot for Mediatek devices is so easy to me. But I don't have any idea for Other devices like Samsung or Sony.
When I bought some SD Card, I'll try this one.
Keep it up!
Click to expand...
Click to collapse
This one is universal bro

iamsubhranil said:
This one is universal bro
Click to expand...
Click to collapse
I did not see you make any modification to boot.img.
Sry My bad. I didn't read at the top.

iamsubhranil said:
Thanx a lot
BTW flashify is also very convenient method
1)Just choose boot image from the option
2)Find and select the internal or external boot image to boot
3)Have a normal reboot
Click to expand...
Click to collapse
I am gonna try this anyway, maybe tomorrow
Because i want two ROMS mainly, one for CM cuz i love it, daily drivers and everday usage, second one mainly focused on battery life (when i don't use my device much)

Another Question ,How do I Flash Zips (from recovery) To A Specific ROM?
And I Have CM 12.1 And Im Using M5 Kernel so Where Do the Edit Goes?

Faisal Z Ahmad said:
Another Question ,How do I Flash Zips (from recovery) To A Specific ROM?
And I Have CM 12.1 And Im Using M5 Kernel so Where Do the Edit Goes?
Click to expand...
Click to collapse
The edit goes to the recovery. At the end of the process you'll have two different recovery files for two OSes. Flashing any zips via modified recovery will flash them straight to the new os. Switch between those recoveries as required. Read the TUT carefully.