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Ultimate Guide for Flashing GSI For Kuntao ( Lenovo P2A42 )

Ultimate Guide for Flashing GENRIC SYSTEM IMAGE.
Contents:
Intro
how to flash gsi.
how to get rooted.
gapps issues
how to get back to non treble rom from gsi or treble enabled builds.
Introduction and basic information:
GSI means Generic System Image, which can be flashed over any Treble Device.
So, in simple words : same System.img can be flashed over multiple devices having Treble Support.
This happens as we now have a separate /vendor partition where all the vendor hals are stored.
Now, this will help to do easy bring ups, Treble builds are smooth af y'all know that and you'll get to flash aosp treble rom
Also, if you own 2-3 treble devices, now you'll just have to download one system.img xD it'll work for all of em ( if treble supported )
How to get Treble Support?
Flashing Treble TWRP won't give you treble support. Keep that in Mind. It'll just mount the partition in the recovery, so that vendor img can be flashed.
To get Treble Support, you'll need to flash a latest ROM which has vendor image compiled with the latest changes by mikeNG, once you flash such a ROM, you'll get the vendor stored in the vendor partition, and after that you can flash any GSI ( as it's just System.img, and all our device specifics are in /vendor so it won't mess with that)
Instructions:
Download Official LineageOS-15.1 treble enabled build from here
Download treble enabled twrp from here
Move both the downloaded files to external sd card (recommended)(optional)
boot in twrp
move to wipe option from twrp.
advanced wipe.
select data and then check if its in ext4 if not format it to ext4 ( do this from official twrp by @celoxocis )
then go to install and install the recovery provided above.
reboot to recovery.
wipe system, data, dalvik, cache & internal storage recommended.
install the lineage os zip and reboot.
download GSI of any rom of your choice. if it is in zipped format extract it and make sure you have a *.img
boot into twrp
wipe anything other than boot, micro sd & vendor
go to install option and then select install image button on bottom right corner
select the gsi of your choice which you have downloaded and install it on system partition.
reboot to recovery (important)
flash mind the gapps if you are going to use gapps in your rom. ( important open gapps have a few issues on treble like many of times gapps dont get flashed or shows some error)
reboot
Kudos you have now flashed a Genric System Image on your Lenovo P2.
for how to get rooted with magisk refer to next post.
and List Of GSI is available here
if you have any doubts even after reading this ultimate guide feel free to post it i will try to answer it and help you with that.

after following instruction as mentioned above
* download the magisk from here
* flash it normally.

A list of GSI and download links can be found here.
https://github.com/phhusson/treble_experimentations/wiki/Generic-System-Image-(GSI)-list
Only A arm64 gsi are supported well on our device and based on arch of our device

how to get back to non treble rom?
* Download the non treble rom your choice
* boot into twrp do wipes as suggested on rom's thread and then flash the rom package no need to mess with vendor partition.

I have managed to flash Dirty Unicorns Rom and its working pretty much well.
Here are some screen shots.

Volte working on GSI?
Volte working on any gsi?

advaithbhat said:
Volte working on any gsi?
Click to expand...
Click to collapse
My network provider don't use volte you can try and tell me
Sent from my Phh-Treble vanilla using Tapatalk

I'm on codeexilir's twrp, can't I use that twrp to flash official los 15.1 to get vendor image and then flash any GSI. Or it is mandatory to use los twrp?

abdal2006 said:
I'm on codeexilir's twrp, can't I use that twrp to flash official los 15.1 to get vendor image and then flash any GSI. Or it is mandatory to use los twrp?
Click to expand...
Click to collapse
I believe You can but I haven't tested that.
Sent from my Phh-Treble vanilla using Tapatalk

If i want to change the gsi img then should i clean flash the los 15.1 again?

imPro01 said:
If i want to change the gsi img then should i clean flash the los 15.1 again?
Click to expand...
Click to collapse
No. Just don't wipe vendor & boot just change GSI
Sent from my Phh-Treble vanilla using Tapatalk

abhayruparel said:
No. Just don't wipe vendor & boot just change GSI
Click to expand...
Click to collapse
Thank you for reply
1) If i go to recovery and flash the new GSI img without anything wipe then it'll work?
2) If i want to go back to Los then how to do it?

Thx abhayruparel.
There is not an aosp p beta yet, no?

After flashing GSI NFC is not working

I can't make any gsi work.Always returns password and reset phone screens on reboot.Entering password says password accepted but decryption unsuccessful.Reset phone takes to TWRP but does nothing and reboots to the same password screen.What to do?

rexit1979 said:
I can't make any gsi work.Always returns password and reset phone screens on reboot.Entering password says password accepted but decryption unsuccessful.Reset phone takes to TWRP but does nothing and reboots to the same password screen.What to do?
Click to expand...
Click to collapse
Changing system and data to ext4 will do the trick probably

Miltonbaidya88 said:
Changing system and data to ext4 will do the trick probably
Click to expand...
Click to collapse
Both are already on ext4.

After flashing gsi got decryption unsuccessful error. How to solve that?

something is very wrong......
First if I flash lineage then any other gsi like pixel experience, it gives me decryption unsuccessful error.... I'm not even able to format the storage to remove encryption. I did format the encryption using an older version of twrp as the twrp provided for treble gives an error like ''
Unable to format data. Unble to remove encryption
-Now When I formatted data using earlier twrp and hen flashed the treble one and then flashed lineage. Booted and it still encrypted my phone. So the loop goes on again.
I dont know whats wrong. Treble flashing should be easy... been awake since last night trying to make it ork by using different combinations but no luck.
can anyone help?

Is there any way to enable volte in GSI?

cant install any OS

Hi guys
So i created quite a mess here..
Device:
Mate 9 L09C432
I had RomAur B197 installed.
Then i tried to somehow get to oreo.
I was able to flash the newest oreo stock firmware with HWOTA tool and it worked but it was unrooted & locked i guess.
So i unlocked it again and flashed twrp 3.2.1-0 fromfuture edition.
Seems like the data was decrypted, i just saw strange filename, so i wiped data, what actually helped.
Unfortunately this somehow broke the system and starting the os caused a bootloop.
Then i discovered that MTP was not working in TWRP so i flashed TWRP 3.2.1-0 by Pretoriano80.
With this recovery MTP was working so i tried to flash an OS somehow.
I tried to flash the stock firmware again with HWOTA8 but it failed at the update.zip
Manual flash in twrp also fails for that update.zip.
I also tried to flash a treble rom from a german forum.
After that twrp was not starting anymore (bootloop).
So back to twrp by fromfuture where MTP is not working, good that i have an SD card.
And i once wiped system because the space was 0mb after that it was fine again.
TWRP gives the following for the update.zip file:
Code:
...
write radio image...
check_write_data_to_partition,write data error update_huawei_pkd_from_ota_zip: update package from zip failed.
E:unknown dommand [errno]
update process ended wit ERROR: 9
Error installing zip file...
So yeah im a bit out of ideas..
Any ideas are welcome
Thanks

Your mistake is trying to flash a custom rom using TWRP. Most treble/Oreo roms can not be flashed with TRWP. Upgrading to Oreo changes the partitions on the device and that may have caused your issue. My advice would be to download the Huawei update extractor and your current firmware. Open up the extractor and extract the recovery ramdisk. Flash the stock recovery via fastboot. Once you have the stock recovery back. Download the Carbonromv4 from openkirin.net and flash that. That you should get you back up and running. Search XDA for how to install a generic treble system img or check the support page on the Openkirin site for instructions.

Thanks for this advice, everything worked
It was that easy but I just didn't know before..
anyways thanks a lot!

karakatos said:
Thanks for this advice, everything worked
It was that easy but I just didn't know before..
anyways thanks a lot!
Click to expand...
Click to collapse
Glad to hear it worked for you! The treble roms work really well and if you are looking for a better camera try the P20 camera port. You will have to re-flash TWRP to install it, but you can then flash the stock recovery back.

Downgrade Nubia X

Hi, how to downgrade from android pie to Oreo without brick the phone?
Is there anyone that have already downgrade the phone with success?
Thanks

Yes just downgrade and boot to recovery and factory reset

Nubia2452 said:
Yes just downgrade and boot to recovery and factory reset
Click to expand...
Click to collapse
Thanks for the answer.
Which recovery have you used? Stock or twrp?
If you run Oreo, can you tell me which partition can be mounted?
On pie I have 2 system partition: system and system_root and I have lots of problem to install gapps.

DoubleJOption said:
Thanks for the answer.
Which recovery have you used? Stock or twrp?
If you run Oreo, can you tell me which partition can be mounted?
On pie I have 2 system partition: system and system_root and I have lots of problem to install gapps.
Click to expand...
Click to collapse
To install gapps on Android 9 mount system_root and flash gapps also for factory restore you can you which ever recovery you want but stock will be there after you flash the update

Nubia2452 said:
To install gapps on Android 9 mount system_root and flash gapps also for factory restore you can you which ever recovery you want but stock will be there after you flash the update
Click to expand...
Click to collapse
I get this error message when I try to install Pico gapps on Android 9:
INSTALLATION FAILURE: Your device does not have sufficient space available in
the system partition to install this GApps package as currently configured.
You will need to switch to a smaller GApps package or use gapps-config to
reduce the installed size.

DoubleJOption said:
I get this error message when I try to install Pico gapps on Android 9:
INSTALLATION FAILURE: Your device does not have sufficient space available in
the system partition to install this GApps package as currently configured.
You will need to switch to a smaller GApps package or use gapps-config to
reduce the installed size.
Click to expand...
Click to collapse
You may have to reflash system partition or just flash firmware though local update in settings and try again if that doesn't work try flashing update though twrp

Help with update to 10.3.4

I have a rooted oneplus 6t with twrp and i want to update from 9.0.17 to 10.3.4,
this video seems to be the easiest method will this method on this video work?
Thanks in advanced!
https://www.youtube.com/watch?v=_8cAtzGE2C0

Flash full rom
Flash twrp
Reboot to twrp
Flash magisk
Done
Bootloop?
Flash magisk uninstaller
Flash magisk
Done
1. Faq
2. Wrong forum (this is 6)

whizeguy said:
Flash full rom
Flash twrp
Reboot to twrp
Flash magisk
Done
Bootloop?
Flash magisk uninstaller
Flash magisk
Done
1. Faq
2. Wrong forum (this is 6)
Click to expand...
Click to collapse
I'm just trying to update without losing data with this video method in the link but i tried it and i get a (error 1) when trying to flash latest update in twrp
Any help will be much appreciated!

mrdreamers said:
I'm just trying to update without losing data with this video method in the link but i tried it and i get a (error 1) when trying to flash latest update in twrp
Any help will be much appreciated!
Click to expand...
Click to collapse
I do the exact way i wrote, never lost data.
Reflash newest twrp if u get error and try again.

whizeguy said:
I do the exact way i wrote, never lost data.
Reflash newest twrp if u get error and try again.
Click to expand...
Click to collapse
i reflashed twrp and now it keeps rebooting back to twrp again eveytime i reboot sysytem, what can i do to fix it?
and when i tried to restore i got a 225 error

I have a new oneplus 6, os 5.1.10 is on it. how can I update it to the current version? no update is displayed directly via OTA. the zip from the oneplus side cannot be installed. is an intermediate step required? if yes, which one and where do the files come from? the goal is to install lineage, with opengapps Pico and magisk for root. but already fails on the ADB flash from twrp. can someone help me?

kallest1100 said:
I have a new oneplus 6, os 5.1.10 is on it. how can I update it to the current version? no update is displayed directly via OTA. the zip from the oneplus side cannot be installed. is an intermediate step required? if yes, which one and where do the files come from? the goal is to install lineage, with opengapps Pico and magisk for root. but already fails on the ADB flash from twrp. can someone help me?
Click to expand...
Click to collapse
At first: backup data and phone memory.
You can do local update (download from official web site oneplus https://oxygenos.oneplus.net/OnePlus6Oxygen_22_OTA_045_all_2004142201_bdd6fdc6b6b1477f.zip, v.10.3.3 or from nonofficial sites 10.3.4, copy to phone memory, main directory, go to settings and system update, make local update - and choose copied file from phone), next after update and restart, do wipe cache, restart and you will see what happend.
Try to read oneplus guide:
How to upgrade system?
Download the software build for your device on this page. Please back up your data before flashing your device.
Plug your phone into your computer and copy the downloaded .zip to your phone’s storage. If you’re using a Mac, you can install Android File Transfer Android File Transfer for this operation.
After the .zip file is copied to your phone, go to 'Settings' - 'system update', click the 'settings' icon on the top right corner, choose 'Local upgrade', find the .zip file and click on 'Install' to confirm.
The update takes about a minute (depending upon the file size), once done reboot your device to boot into the latest Oxygen OS.

RROs + firmwareupdate

Hello Guys, I need some help: I installed Resurection Remix v8.6.6 with the fw V12.0.7.0.qjgeuxm and would like to update it to V12.0.8.0!
The Rom is encrypted, however!
What steps do I have to carry out to cancel the encryption and flash the new firmware?
Many thanks in advance
greetings
H0rdak

if you only want to flash firmware 12.0.8 flash this in recovery and you don't need to do anything else, reboot to recovery just to be on the safe side, then reboot to system...
on the other side, if you want to reflash whole 12.0.8 SW base, that's another case...

THX JERYLL, you're a great help again !!!!
Okay, I mean, I transfer the FW zip file to the phone and install it via Orange Fox?! I still did not understand that with the encryption as explained in the RR thread! Can I easily flash the ZIP file?

H0rdak said:
THX JERYLL, you're a great help again !!!!
Okay, I mean, I transfer the FW zip file to the phone and install it via Orange Fox?! I still did not understand that with the encryption as explained in the RR thread! Can I easily flash the ZIP file?
Click to expand...
Click to collapse
yes either download or transfer, then flash in recovery, I did it yesterday, so its safe to do

thanks jeryll,
i have done it now and the system has displayed an error message at the vendor! Do you know whether the update was successful anyway, and where can I read which fw is now installed on the phone ?!

if you did flash only firmware part of 12.0.8 you can't see it in system as a regular update as you only updated drivers which allow to communicate between SW and HW, so when you start up OFOX, on its initial screen you can see the number of the last flashed whole MIUI ROM (for example if before flashing custom ROM you were on MIUI 12.0.6, then flashed RR 8.6.6, now updated only fw part of 12.0.8, your system will still be shown as 12.0.6...
If you are hunting this new number 12.0.8 and not pure functionality, you'll need to reflash full recovery version of MIUI 12.0.8 EU, that will reflash most of the needed components on your phone including vendor and product and then you'll see that number in OFOX. But because in the process your original custom ROM will be overwritten with MIUI, you'll need to reflash RR + GAPPS + Magisk too before you reboot in to system...

Thx, but can I assume that the update has now been carried out successfully, even if this vendor error has occurred?

what vendor error? if your system is booting and working ...

its said: "Failed to mount '/vendor' (invalid argument)" , writen in red !

if it's not showing permanently, all should be okay

Thank you Jeryll !!

Jeryll, a last question that has nothing to do with the firmware topic in itself: My RROS (8.6.6) is encrypted. If I want to update to 8.6.7, should i decrypt first or can I just flash the new update via recovery?!

just dirty flash 8.6.7 over 8.6.6 and reboot to system, check if playstore is working and if magisk is present (optional depends on you using google stuff and root) if needed reboot to recovery, reinstall gapps and magisk ... that should work... I was unable to do clean flash of RR on decrypted storage...

Jeryll, you made my day again !! Many Thanks!!!
Greeting H0RDAK