[Recovery][TWRP][EMUI8.x] [P20 Lite] Testing

[Pretoriano80]

Disclaimer​

This software comes wth no warranty,XDA staff ,myself or TeamWin staff can't be hold responsible for any damage it may cause to your device.

Note: Currently Oreo 8.1 custom roms are not supported,only stock EMUI 8.x .

Download and Installation​

* Download twrp recovery
* Start your device in fastboot mode
* Install the recovery using the following command:

fastboot flash recovery_ramdisk [filename].img --> ex: fastboot flash recovery_ramdisk twrp_p20_lite_0.1.img

* Restart with this command:

fastboot reboot

* As soon as you execute the restart command,remove the USB cable and keep pressing Volume UP,so the device will boot to TWRP.This is to avoid that the device boot to OS,overwritting TWRP recovery.

Features​

Internal storage decryption = working
MTP and OTG connection = working
Backup&Restore = working

Note: There are no sources for this yet,because is based on the work of @zxz0O0 ,from Honor 9.

Contributors
**** Pretoriano80
**** @zxz0O0 - This wouldn't be possible without this guy,so big big thank to him.I used his base to make this recovery work ,so in sign of respect his nick will also be on the TWRP boot screen.Thank again buddy!
**** TeamWin project ,obviously.

**** Team OpenKirin - thanks for the "Oem Path wipe esclusion" code

Download links
twrp_p20_lite_0.1.img - initial release

 

[fabio87]

Bootloader says:

PHONE Unlocked
FRP Lock

I get writing to ramdisk error:

sending 'recovery_ramdisk' (24952 KB)...
OKAY [ 0.624s]
writing 'recovery_ramdisk'...
FAILED (remote: Command not allowed)
finished. total time: 0.640

Update: nevermind, forgot to enable oem unlock to remove FRP. (I will leave the original message for other users)

Update 2: Works.
- Data decryption and backup were successful
- MTP works
- Zip flashing successful
- OTG connection works

 

[Pretoriano80]

Bootloader says:

PHONE Unlocked
FRP Lock

I get writing to ramdisk error:

sending 'recovery_ramdisk' (24952 KB)...
OKAY [ 0.624s]
writing 'recovery_ramdisk'...
FAILED (remote: Command not allowed)
finished. total time: 0.640

Update: nevermind, forgot to enable oem unlock to remove FRP. (I will leave the original message for other users)
Update 2: Works. Data decryption and backup were successful. MTP works. Zip flashing successful.

Thank you for testing Fabio, i will edit the OP in this case. If you can, please also test OTG connection.

 

[fabio87]

Thank you for testing Fabio, i will edit the OP in this case. If you can, please also test OTG connection.

OTG Works. I updated my test reply.

Needless to say. THANK YOU!

 

[Pretoriano80]

OTG Works. I updated my test reply.

Needless to say. THANK YOU!

No problem.Can you get me the recovery.log and dmesg ,please?

 

[JamesBott]

@Pretoriano80

YOU ARE THE BEST !!!

my test
flash twrp
twrp/Backup data + system to internal storage : work
twrp/Backup data + system to external_sd : work
reboot to system
install test-app
reboot to twrp
twrp/Restore data + system : work
reboot to system
phone work and test-app is out

NOW is this phone a very good phone
NOW can i test other rom and "short restore" (if i use new phone i need minimum 1h for settings and app install, now twrp/restore = 2..3 minutes)

Many thank's for your good work (and your helping friends) !!!

Excuse me, with my joy i forgot recovery.log View attachment recovery.log

 

[Pretoriano80]

Thanks for testing! A recovery.log would also be useful.
Beware that this recovery might not work with custom roms. However, it can still be used to restore your data after testing custom roms, in case you want to go back to EMUI.

 

[fabio87]

No problem.Can you get me the recovery.log and dmesg ,please?

Here are the logs.

I installed a zip file containing a titanium backup app+data to test it out and it jammed and reverted back to stock recovery.

I flashed the recovery again and works, but I'm not sure what happened.

 

[Pretoriano80]

Here are the logs.

I installed a zip file containing a titanium backup app+data to test it out and it jammed and reverted back to stock recovery.

I flashed the recovery again and works, but I'm not sure what happened.

Thanks, logs look fine.
Try to flash that titanium backup and then reboot to recovery instead of android system.

 

[JamesBott]

@Pretoriano80
excuse me : if you need - in post #6 recovery.log appended
excuse my bad english inside PM. shame on me
i hope this is what you need (twrp setting to english)
View attachment dmesg.txt.gz View attachment recovery.log

 

[mchtt]

Thanks a lot for this !
If i wanna go back to stock recovery, should i flash "recovery_ramdis.img" ? (no typo error this is the dump i get from the stock firmware)

 

[Pretoriano80]

Thanks a lot for this !
If i wanna go back to stock recovery, should i flash "recovery_ramdis.img" ? (no typo error this is the dump i get from the stock firmware)

Yes, just flash that with fastboot and your stock recovery will be back.

 

[mchtt]

Thx a lot, it's time to flash !
edit: fastboot reboot not working on my device, but a Power+Volume Up did the job.

Is the "Failed to unmount /system" normal ?

---------- Post added at 02:58 PM ---------- Previous post was at 02:30 PM ----------

Also got a "Unable to locate /boot partition for backup calculations"

View attachment recovery.log.zip

 

[fabio87]

Thanks, logs look fine.
Try to flash that titanium backup and then reboot to recovery instead of android system.

It wouldn't let me. TWRP just gets stuck at 'Done!' and nothing happens, when I hard reset it just goes back into system and when I reboot into recovery it is back to stock.

Anyway, it's really not a big deal at the moment, I was just pointing out some sort of bug.

 

[mchtt]

After a twrp backup, i flashed a rom, then went back to twrp to do a wipe but it is stuck at the TWRP logo.

 

[fabio87]

After a twrp backup, i flashed a rom, then went back to twrp to do a wipe but it is stuck at the TWRP logo.

Have you tried to flash twrp again?

 

[mchtt]

yes, same. i cannot boot into twrp anymore...

 

[Pretoriano80]

It wouldn't let me. TWRP just gets stuck at 'Done!' and nothing happens, when I hard reset it just goes back into system and when I reboot into recovery it is back to stock.

Anyway, it's really not a big deal at the moment, I was just pointing out some sort of bug.

Well, it might be an issue with the updater script that Titanium Backup is using.

After a twrp backup, i flashed a rom, then went back to twrp to do a wipe but it is stuck at the TWRP logo.

Custom Roms are not supported for now, some may work, others not.

 

[mchtt]

Yes i reverted to stock rom and now TWRP boots again....
I tried a treble rom by the way.

---------- Post added at 04:11 PM ---------- Previous post was at 04:05 PM ----------

But i can confirm that backup / restore functions are working

 

[Pretoriano80]

Yes i reverted to stock rom and now TWRP boots again....
I tried a treble rom by the way.

---------- Post added at 04:11 PM ---------- Previous post was at 04:05 PM ----------

But i can confirm that backup / restore functions are working

Yes, but it would be great to have the same functionality with custom roms, too.
If anyone is testing custom roms, please provide me the /system/build.prop and /vendor/build.prop.