Related
First of all... Thanks Chainfire!!!! This is totally based on your work.... i made only some MOD....
Ok, the work is quite finished... the CF-ROOT for I9003 is ready!
I called this "beta version" (since i need your tests/opinions) but all might work.
IMPORTANT: This is only for KPH Firmware!!!
You can flash this over any other CWM or over the stock FW.
Many people will ask "Why i have to install this?"... because with this your phone will have:
- Root ( don't need to use SOC or any ZIP);
- Busybox 1.17.2;
- Sqlite3 v3.7.2;
- init.d support (you can put in the folder /system/etc/init.d all the script that you want to be loaded at the startup);
- New fixed CWM ( unyaffs issue has been fixed - offline charge fixed - USB storage mode while in CWM fixed);
- Add EXT4 support to the phone ( so you can convert the filesystem to ext4 to improve performance);
- full working CWM Manager (backup - restore - delete backup - install apk - flash update.zip - flash kernel - reboot to CWM);
- Tweaks Manager with various tweak ( Ram Min Free - SD Speed - I/O Scheduler - Kernel Scheduler - CPU Conservative Governor - Swappiness - Ram Script by Juwe11 - Media Stagefright)---> Many people asked for Juwe Ram Script ---> to enable it completely choose in the Tweaks Manager: Ram Script - Ram Min Free and Swappiness;
- Auto ZIP-Align on boot - You can choose it in the tweaks app(NEW)
- Reviewed tweaks values (some from darky's rom some from hardcore some from other post in XDA)( thanks to bigeyes0x0 and Misledz )(NEW)
- Custom Boot-Animation support (place your custom bootanimation in /system/media/ and call it sanim.zip)(NEW)
To do:
- other tweaks suggested by you...
- whatever can be added.
Let me know what you think
HERE you can find the original post.
HOW TO INSTALL:
1- Flash with Odin the .tar file
or...if you went from a previous version of CF-ROOT
2- Download the .zip file into the external SD the open CWM Manager --> flash Kernel --> select the file you have just downoaded
IMPORTANT:
If you cannot find the two apps on your app drawer maybe you haven't space left on /system so delete some unused apps like aldiko, delere /system/cfroot folder and reboot
IMPORTANT/2: after the flash the phone might take some time to boot. You might think that it freeze on Samsung Logo but it's normal cause the auto-zipalign proc need some time. Just Wait.
UPDATE: Added CF-ROOT with my custom kernel. This have Ext4 inside the kernel (no modules) and OC to 1.1 Ghz. I think that it is secure. I haven't test it very well so please report me the issues you will find.
!
Version 05.09.2011 Changelog:
- added Graphics Boost Tweak (thanks Gana)
- added acid tweaks (thanks to the people that worked on it .. specially Bigeyes0x0);
- reviewed 00tweaks file by Bigeyes0x0;
To disable journaling on ext4 partition apply the attached journaloff.zip in CWM (Not CWM Manager app - it must be fixed).
There're two version of the CF-ROOT, the version with **CWM_Manager** can be flashed with CWM Manager App (select flash kernel) the other with odin (like always)
UPDATE 20.10.2011:
CF-ROOT for XXKPM can be found HERE:
- Standard Version --> http://www.multiupload.com/S463K75UED
- Surprise version ( i suggest you this) --> http://www.multiupload.com/G20L6PL5WC
What's new ?
- I finally finished the custom bootanimation support.... now works like he have to works. Just copy your bootanimation into /system/media and rename it to sanim.zip.... i think that here you can find what you need http://forum.xda-developers.com/showthread.php?p=17322814#post17322814
IMPORTANT!!!
If you have installed the beta version you must know that the ext4 conversion for that doesn't work properly. Ok, system, cache and dbdata will be on ext4 but data not. This because the init binary check on boot if /data have rfs FS and, if not, it format the partition wiping all your data.
In the new version i modified the init binary so it cannot do it more
I must say that i became mad to discover this damn thing !
A few questions: Are you using the latest fixed version of CWM? Also you mentioned that you would be releasing another update soon regarding the Nandroid backup image corruption issue. Is it in this release?
Also: Is this an alternative to ROM manager, apart from the inclusion of the tweaker tool?
Regarding the enhancements, could you please elaborate on some of them and what is safe/not safe to use (particularly in the tweaks and what they do)?
What I understood, after looking over all the posts, was that you optimized the CF-Root by chainfire for the i9003, by using a compatible Root, CWM, and adding an ext4 kernel? Are you going to port the ext4 converter tool as well? Will we be able to use an external SD card with ext4 formatting (Could be used to store files larger than 4GB)?
Sorry about the ton of questions. Trying to learn, and what better way to learn than from the best!
I'm going to take it out for a test drive now on XXKPE with ext4! Will report back later!
Thanks for your valuable work, I'm a huge fan!!!
Cheers
Update: Confirming that the passive charging bug has been fixed! Thanks Skin1980!
I cannot find the CWM or Tweaks icons in the app drawer as indicated in your screenshots. I can access CWM recovery mode using the 3 button combo though.
I had installed the last version of CWM by Amit and formatted with ext4 and I just used ODIN to flash over that install. I tried flashing again, still not appearing in app drawer. Any solutions?
Great job skin.. Hoping for the early release of a stable one.. Will test it later
Sent from my GT-I9003 using XDA Premium App
it's great...>.<
Auguri! Ok wow, This is pure genius . I've always been wondering what our CWM were based off. I guess using this would fix most issues people get when flashing CWM, since it's based off the original firmware
Also I'm loving the tweaks, they seem to make the phone more smooth, Although I've seen a few bugs after applying this I can't seem to use the V6 charger script anymore I get an error, will be posting one shortly. There are some minor hiccups in between and I tend to get FC on some apps when I multitask.
Edit: Turns out It's busybox related, no shell access. I've tried launching Busybox by Stericsons to check and It says no root access was given and boots me out.
i happy that u r belong to this community
Is there any recovery module or tweak available, in which we can handle basic file operation like copy, move from sd card to system or any thing similar?
Erahgon said:
A few questions: Are you using the latest fixed version of CWM? Also you mentioned that you would be releasing another update soon regarding the Nandroid backup image corruption issue. Is it in this release?
Also: Is this an alternative to ROM manager, apart from the inclusion of the tweaker tool?
Regarding the enhancements, could you please elaborate on some of them and what is safe/not safe to use (particularly in the tweaks and what they do)?
What I understood, after looking over all the posts, was that you optimized the CF-Root by chainfire for the i9003, by using a compatible Root, CWM, and adding an ext4 kernel? Are you going to port the ext4 converter tool as well? Will we be able to use an external SD card with ext4 formatting (Could be used to store files larger than 4GB)?
Sorry about the ton of questions. Trying to learn, and what better way to learn than from the best!
I'm going to take it out for a test drive now on XXKPE with ext4! Will report back later!
Thanks for your valuable work, I'm a huge fan!!!
Cheers
Update: Confirming that the passive charging bug has been fixed! Thanks Skin1980!
I cannot find the CWM or Tweaks icons in the app drawer as indicated in your screenshots. I can access CWM recovery mode using the 3 button combo though.
I had installed the last version of CWM by Amit and formatted with ext4 and I just used ODIN to flash over that install. I tried flashing again, still not appearing in app drawer. Any solutions?
Click to expand...
Click to collapse
1- The CWM used is always the last... if i'll update the CWM i'll update the CF-ROOT;
2- The CWM fixed reguard nandroid backup is under test;
3- My CWM isn't ROM Manager compatible... with the CWM Manager from Chainfire you can do a lot of things without going into CWM
4 - to convert in EXT4 just follow the guide on the other thread;
5- Not sure if you can format in XT4 your external_sd... try ;
6- The tweak are all sure... now i haven't time to exlplain better... some don't work.... some other work.
7- If the icon don't appear in app drawer try to check into system/app if the two files are there... if not try to remove /system/cfroot folder and reboot. Maybe your system folder is full so you can install they manually, the original apk are inside /res/misc/ folder.
8- bye
for me wifi not working obtaining ip address,gps not lock can i flas normel bootimg.ur work is awesome thx
bala242 said:
for me wifi not working obtaining ip address,gps not lock can i flas normel bootimg.ur work is awesome thx
Click to expand...
Click to collapse
I'm sorry.. for me everything is working...Before my CF-ROOT all works?
ur a superhero man!!
great ;-)
Skin1980 said:
I'm sorry.. for me everything is working...Before my CF-ROOT all works?
Click to expand...
Click to collapse
ya everything work before,can i reflas ur ver cwm?any body get this error?
Is there any tweak for increasing the 2g speed ??
or getting 3g speed in 2g plans...
I need this very badly...
I am not getting exact idea that what exact cf root does??? Or how cf root is so special...?? Will this make our work easy to do changes in kernal (that would be great)...???
Please can anybody in simple language....!!!
anigr88 said:
Is there any tweak for increasing the 2g speed ??
or getting 3g speed in 2g plans...
I need this very badly...
Click to expand...
Click to collapse
What your asking for is impossible.
Update!
The problem I had turned out to be due to the lack of space in the "/system" folder - as you had predicted Skin1980! Once I deleted some unnecessary software, I was up and running fully within minutes!
The phone works great! The fixes are really good! Having no issues except for one so far. I can't seem to mound "sdcard" in CWM recovery mode and cannot do a restore, for the same reason, from the CF-ROOT menu.
I have a feeling it's something I did wrong earlier, so I'll reflash completely and try again ('cause I have a lotta time on my hands atm and I want the bestest possible phone I can get).
Note: This doesn't seem to be compatible with DDKB2. Assuming that this is mainly for GB firmwares? Can someone corroborate this?
As usual, thanks!
Erahgon said:
The problem I had turned out to be due to the lack of space in the "/system" folder - as you had predicted Skin1980! Once I deleted some unnecessary software, I was up and running fully within minutes!
The phone works great! The fixes are really good! Having no issues except for one so far. I can't seem to mound "sdcard" in CWM recovery mode and cannot do a restore, for the same reason, from the CF-ROOT menu.
I have a feeling it's something I did wrong earlier, so I'll reflash completely and try again ('cause I have a lotta time on my hands atm and I want the bestest possible phone I can get).
Note: This doesn't seem to be compatible with DDKB2. Assuming that this is mainly for GB firmwares? Can someone corroborate this?
As usual, thanks!
Click to expand...
Click to collapse
after a whole day of using it. The phone will tend to lag and build up after a while. You'll notice the phone becomes slow again. I don't know what's going on.
Misledz said:
What your asking for is impossible.
Click to expand...
Click to collapse
I just want a small boost in the speed ....
Misledz said:
after a whole day of using it. The phone will tend to lag and build up after a while. You'll notice the phone becomes slow again. I don't know what's going on.
Click to expand...
Click to collapse
I did notice that initially it was fast. But as I kept it going through the day to recalibrate the battery, it did slow down and start to lag. I thought it was something to do with that. Also I felt that I had done something wrong with the flashing.
Going to overhaul my phone completely: Format, re-partition, XXKPE install (flashing twice), flash fixed CWM from the other thread, root using SOP 2.1.1, install busybox requirements for deodexing (this failed for me the last few times), restore settings using Titanium Backup, Nandroid backup, ext4 this baby, restore, and then install CF-ROOT to monitor.
Wish me luck! See you guys on the other side... again!
anigr88 said:
I just want a small boost in the speed ....
Click to expand...
Click to collapse
You've got the wrong thread mate!
Your bandwidth is capped by you operator and is dependent on how much they allocate you. On top of that 2G is physically limited to certain speeds which, usually, cannot be surpassed by legal means, and the illegal ones give you too less of a boost vs complications and errors to even bother about (I mean big ass hardware)!
This question is probably already asked, but I can't find a clear answer for it.
2nd thing is that I can`t see the forest for the trees anymore cause I'm quite an android noob.
I wan't to try to build a custom rom, but how do I get started?
As far as I know there are 2 ways:
1) Take an existing rom (either stock or custom) and mod it.
2) Start from scratch.
The 2nd method is of course the most interesting (but probably also the hardest) method.
So say we take that method.
First of all I think android basically consists of 2 parts, being the kernel + all the rest.
You can take a kernel from a working rom, which may be moddified, but can you also build the original kernel from the source? For getting that to work on my device I'll probably need the drivers, but how? Extract it from the latest official rom? And how to add them?
Samsung (yes I have a samsung s5660 aka gio) also uses the rfs filesystem, would it be possible to use ext4 and does the kernel need to be adapted to that?
And how do you make the rom flashable for odin?
A lot of questions, I know, but isn't there a step to step guid for doing this kind of things?
Thanks
yes, its possible to create an odin flashable rom with ext4 as default filesystem. and yes, obviously the kernel need to support ext4.
read this thread, particularly the first post.
http://forum.xda-developers.com/showthread.php?t=1202049
Hey guys, I was just wondering if someone could help me out with a problem.
I put ROMs on my phone at least once every month or so. The question I have is.
If I wanted to make sure I was cleaning up old kernel settings what would be the best steps to take.
Sometimes I just want to change kernel and not ROM. For example, I am on aicp ROM and would like to change
Kernel but I changed settings with kernel tweaker and I don't really know
How to make sure I got rid of settings before flashing next kernel.. Thanks in advance..
Hi edshawn911
There's a boot partition which actually contains the kernel You can wipe it with TWRP as far as I know
Furthermore I'd use the file manager (also available in TWRP) to take a look at your sdcard (internal storage). You might find some config files which were generated by your kernel tweaking app.
Just reflash/dirty flash your ROM then flash your new kernel. Clear data on any kernel apps if you use one. Nothing else.
when you flash a new kernel, itll clear out the old kernel settings automatically. but some kernels still leave behind stuff. most kernels are just kernels, while some add system files as well. you can check places like /etc/init.d and delete whatever is there if a kernel left some files.
experience7 said:
Hi edshawn911
There's a boot partition which actually contains the kernel You can wipe it with TWRP as far as I know
Furthermore I'd use the file manager (also available in TWRP) to take a look at your sdcard (internal storage). You might find some config files which were generated by your kernel tweaking app.
Click to expand...
Click to collapse
Thanks for response..
I usually backup the ROM I'm on with the included/stock kernel before flashing another kernel. When I want to switch, I simply restore the backup beforehand. My current backup has the barebones AOSP kernel.
This kernel was built originally only for private use, but some of you have asked for it so I've decide to share.
I'm not responsible: You use at your own risk.
This kernel is based on latest LineageOS source code, with only a few tweaks in config file and maybe any external commit. It's more a "proof of concept" than a development by itself. My philosofy is "keep it simple"... I don't look for a "overloaded super-kernel with steroids"... if you want many features (exotic governors, OC, etc...) and "bleeding edge" functionalities there are some good alternatives made by good devs here so this kernel is not for you. Maybe other kernels can benefit by this approach in the future.
The approach for BitO-K is a light and stable kernel optimized via some basic params in kernel config and built with latest Toolchain (TC) to get a very optimized code for our device's architecture.
Fronts attacked: Task scheduling (SMT enabled), task efficiency (CleanCache/FrontSwap and other minor tweaks) and IO optimization (the only commit you can see ATM in my source branch) and, depending on version, latest Toolchains from Linaro or UBER. ATM no more "magic"...
*In my personal device I'm also testing with /data and /cache partitions on F2FS instead of EXT4 (this also helps...). Maybe new thread in the future about this...
Download
You can get latest version here.
Installation
Make backup
Install via TWRP
Wipe Dalvik/Cache
Reboot and profit
Notes
You can disable thermal control bins from xiaomi to avoid some lag if you get your CPU hot... Revise your config to be sure you don't get a brick...
You can install on any ROM, but if MIUI based, then you can get some features not to work, like WIFI, etc... If you want to test on MIUI, you have info here, thx to @Hen Ry
How to delete thermal control binaries by Xiaomi
You need root permissions (I suggest Magisk 13.6+)
Go to /vendor/bin
Delete (I suggest to move to a backup folder into /vendor/bin or rename files, not delete):
perfd
thermal-engine
Additonally you can delete (or move/rename to *.bak) file:
/etc/thermal-engine-8996.conf
My Kernel Settings (Kernel Adiutor)
Not necessary the best ones, only the ones I usually set (battery/performance balanced, smooth behaviour, almost total lag free):
CPU BIG MAX: 1900 MHz
CPU LITTLE MAX: 1440 MHz
GPU MX: 560 MHz
Governor: Interactive
Other minor tweaks (sometimes I set them):
IO: Disabled statistics
...
Source Code
https://github.com/BitOBSessiOn/android_kernel_xiaomi_msm8996
How to convert FS's from EXT4 to F2FS (IO performance improvement)
Be prepared to break it all... Again: at your own risk
Your TWRP must support F2FS (look for my latest TWRP-MROM )
Your kernel (on primary or secondary) must support F2FS (usual if LineageOS based)
Your system (on primary or secondary) must support F2FS mounting (fstab.qcom file updated with F2FS entries for /cache and /data ) (usual if LineageOS based)
Make a backup of ALL your data you want to keep (/data partition via TWRP backup + DCIM, WhatsApp folder, etc... ) (I suggest copying/backup via USB from TWRP)
In TWRP go to: Wipe / Advanced Wipe / Change or repair file system / Change file system for /cache and /data and select F2FS
Restore your /data partition from TWRP backup and manually copy your extra folders (DCIM, Whatsapp, etc...)
Reboot and profit
Testing! :highfive:
Behaving awesomely both on RR and AICP, the two roms I've tested it so far with some minor kernel auditor tweaks.
Thanks dev!!!
Awesome with @marchetto96 ViperOS!!
Testing with LOS. So far so good. Thanks Dev
albertoduqe said:
Behaving awesomely both on RR and AICP, the two roms I've tested it so far with some minor kernel auditor tweaks.
Thanks dev!!!
Click to expand...
Click to collapse
Hello Mate. May I please ask if you can share the tweaks / config in Kernal Audiutor ?
It's all placebo or its doing its job very well and very quietly. Either way, its not breaking anything or making anything worse, so bravo.
VerucaSalt said:
Hello Mate. May I please ask if you can share the tweaks / config in Kernal Audiutor ?
Click to expand...
Click to collapse
Governors to interactive. CPU max to 1900 and 1440, GPU max to 560. Thermal bins deleted.
It's not my idea though, I just learnt and copied from the boss
Happy tweaking!
Sent from my MIX using Tapatalk
albertoduqe said:
Governors to interactive. CPU max to 1900 and 1440, GPU max to 560. Thermal bins deleted.
It's not my idea though, I just learnt and copied from the boss
Happy tweaking!
Sent from my MIX using Tapatalk
Click to expand...
Click to collapse
How to delete thermal bin?
rhong said:
How to delete thermal bin?
Click to expand...
Click to collapse
OP updated with little howto.
How to jump from EXT4 to F2FS
Second post updated with a little guide: How to convert FS's from EXT4 to F2FS (IO performance improvement)
BitOBSessiOn said:
Second post updated with a little guide: How to convert FS's from EXT4 to F2FS (IO performance improvement)
Click to expand...
Click to collapse
Cheers. I'm going to try this F2FS mod out but it's going to take forever just to copy everything off my phone (256GB model, almost full). If I switch data to F2FS will it kill the encryption (I don't want it to be encrypted anyway)? If not, I may as well get rid of it now when all my personal files are backed up to my PC.
gavin19 said:
Cheers. I'm going to try this F2FS mod out but it's going to take forever just to copy everything off my phone (256GB model, almost full). If I switch data to F2FS will it kill the encryption (I don't want it to be encrypted anyway)? If not, I may as well get rid of it now when all my personal files are backed up to my PC.
Click to expand...
Click to collapse
Ummhhh.. I always assume an unencrypted scenario... but indeed you lose encryption when reformatting to another FS, you must re-encrypt after formatting (target FS must be encryptable).
BitOBSessiOn said:
Ummhhh.. I always assume an unencrypted scenario... but indeed you lose encryption when reformatting to another FS, you must re-encrypt after formatting (target FS must be encryptable).
Click to expand...
Click to collapse
I copied everything off, took a backup of data in TWRP and copied it to the PC too. Wiped data/cache, changed both to F2FS and rebooted into recovery. Copied the data backup back to the phone and restored (gave a warning about it being from an EXT4 source but it restored ok). Rebooted into Resurrection Remix and in the settings it still says it's encrypted. To get it decrypted I had to use the 'Format Data' option in TWRP (as opposed to ticking data and wiping it).
Between the new kernel, some tweaks in EX Kernel Manager (mainly ondemand governor for CPU and performance for GPU), and decryption, I'm getting the highest Antutu scores I have for months. Just got 156k (60477/53925/31252/10475). Now I just have to wait while it copies 200GB+ of stuff back to the device.
gavin19 said:
I copied everything off, took a backup of data in TWRP and copied it to the PC too. Wiped data/cache, changed both to F2FS and rebooted into recovery. Copied the data backup back to the phone and restored (gave a warning about it being from an EXT4 source but it restored ok). Rebooted into Resurrection Remix and in the settings it still says it's encrypted. To get it decrypted I had to use the 'Format Data' option in TWRP (as opposed to ticking data and wiping it).
Between the new kernel, some tweaks in EX Kernel Manager (mainly ondemand governor for CPU and performance for GPU), and decryption, I'm getting the highest Antutu scores I have for months. Just got 156k (60477/53925/31252/10475). Now I just have to wait while it copies 200GB+ of stuff back to the device.
Click to expand...
Click to collapse
Battery? Stability? Smoothness...? Thx for feedback
BitOBSessiOn said:
Battery? Stability? Smoothness...? Thx for feedback
Click to expand...
Click to collapse
I always found ondemand to give the smoothest experience and that's exactly what I'm getting here. It feels like being back on MIUI (that's a good thing).
I can't give any input battery-wise as I'm rarely away from a charger and don't care about battery life (within reason obviously), so I never monitor it.
As for stability, I did temporarily lose WiFi connectivity (other network devices were fine), and when that dropped out I lost mobile data too. This happened when I was transferring the last batch of files I forgot to restore via USB. I've been using RR for weeks and it has never happened before, but it could just be a one-off. It took a reboot to resolve.
I have noticed the device can get very warm when transferring a large number of files over WiFi. It has always been like that regardless of kernel. I had the case on when I lost connectivity so I couldn't feel if it was that warm, but maybe that sustained high temp buggered the WiFi. If it happens again I'll let you know.
I should note that I had the thermal files removed (I've always deleted them from I first got the device). I also usually run the OC'd DragonXia kernel so my device is no stranger to a little extra heat.
I'm using it for a day now. so far so good. Latest Mokke rom, working flawlessly. using ondemand governor with stock clocks, CFQ and I/O Scheduler with 2Mb read ahead value.
only odd thing I have noticed so far is that WiFi signal seems to be a bit weaker. In places that I had connectivity before, now I'm not in range.
Otherwise all good! Keep up the good work, and thanks man!
BitOBSessiOn said:
How to convert FS's from EXT4 to F2FS (IO performance improvement) (-- WIP --)
Be prepared to break it all... Again: at your own risk
Your TWRP must support F2FS (look for my latest TWRP-MROM ) -- perhaps 4/128GB pending, WIP --
Your kernel (on primary or secondary) must support F2FS (usual if LineageOS based)
Your system (on primary or secondary) must support F2FS mounting (fstab.qcom file updated with F2FS entries for /cache and /data ) (usual if LineageOS based)
Make a backup of ALL your data you want to keep (/data partition via TWRP backup + DCIM, WhatsApp folder, etc... ) (I suggest copying/backup via USB from TWRP)
In TWRP go to: Wipe / Advanced Wipe / Format Partition and select /cache and /data and format to F2FS
Restore your /data partition from TWRP backup and manually copy your extra folders (DCIM, Whatsapp, etc...)
Reboot and profit
Click to expand...
Click to collapse
my rom is aicp,after converted，i can not mount the data,but the speed is really fast
315602494 said:
my rom is aicp,after converted，i can not mount the data,but the speed is really fast
Click to expand...
Click to collapse
Weird... seems that AICP does not include F2FS entries in fstab.qcom file...
If I have time I will try to make a zip to inject updated fstab.
I need a custom rom + kernel that has the best battery life and storage usage because asus's stock rom (at least on this device) has so much bloatware (so it uses so much storage)
and since i only have 16gb of storage, i need to save space
also it drains my battery pretty bad, i don't really care about other things (performance, customizations, features, etc) since i only use this device for whatsapp, and social media
My device is Asus Zenfone Selfie ZD551KL (Z00T)
Flashing a Custom ROM requires having a Custom Recovery ( like TWRP ) previously installed. So it's on you to look for a suitable Custom Recovery as 1st thing of all things.
Okay so i found out that most custom recoveries are just either cwm or twrp with some other functionality that i dont need, so i decided to just use the mainstream twrp since for some reason i can't access the official cwm website, but now i still don't know what custom rom + kernel should i use
Only to clarify:
Android ROM contains full Android operating system and a few system apps that comes pre installed with the device.
Android's kernel works as an intermediator between the operating system and the hardware. Kernel is the heart of Android. Android’s kernel is a modified version of the Linux kernel and resides inside the Android operating system.
Knowing this you have to find a Custom ROM what is at 100% suitable to your Asus Zenfone Selfie ZD551KL (Z00T) .