[GUIDE] - How to root debrand and/or remove Retail mode for P20pro CLT-L29

[Sleipnirr]

Let me tell my experience:

I had CLT-AL00 181 which is pie. After unlocking bootloader I downgrade it to 176 which is oreo using this topic. It gave some errors, went recovery or erecovery I don't know it made something, It finally it opened but version number was chipset-boston. Then I followed post #152 on this post for rebrand and it totally worked. Finally my version was CLT-L29 161. It was working very well but I decided to update it to pie which I understood I should NEVER try. I use EMUIFlasher_1.0.apk to upgrade and it gave error during process. Now my phone don't turn on. No screen, no vibration, nothing. But when I connect it to PC, It says it is in fastboot. So I think I have some chance to recover it. I tried fastboot commands to unbrick they seems they are working but nothing changed. Then I buy Type C - USB adapter to try Dload method but I couldn't sure I put it download mode because I couldn't see anything. I think there is also another chance to unbrick it. "Test point" method. I will try it when I disassembly my phone.
Last status:

Edit: I may find something causing error:
"fastboot oem get-build-number" command replies: (bootloader) :CLT-L29 8.1.0.161(C432)
"fastboot oem oeminforead-SYSTEM_VERSION" command replies: (bootloader) :CLT-AL00 9.0.0.167(C00E55R1P15)
So I think I should downgrade system version "fastboot flash system system.img" seems working but version number doesn't change.

 

[dladz]

Let me tell my experience:

I had CLT-AL00 181 which is pie. After unlocking bootloader I downgrade it to 176 which is oreo using this topic. It gave some errors, went recovery or erecovery I don't know it made something, It finally it opened but version number was chipset-boston. Then I followed post #152 on this post for rebrand and it totally worked. Finally my version was CLT-L29 161. It was working very well but I decided to update it to pie which I understood I should NEVER try. I use EMUIFlasher_1.0.apk to upgrade and it gave error during process. Now my phone don't turn on. No screen, no vibration, nothing. But when I connect it to PC, It says it is in fastboot. So I think I have some chance to recover it. I tried fastboot commands to unbrick they seems they are working but nothing changed. Then I buy Type C - USB adapter to try Dload method but I couldn't sure I put it download mode because I couldn't see anything. I think there is also another chance to unbrick it. "Test point" method. I will try it when I disassembly my phone.
Last status:


Edit: I may find something causing error:
"fastboot oem get-build-number" command replies: (bootloader) :CLT-L29 8.1.0.161(C432)
"fastboot oem oeminforead-SYSTEM_VERSION" command replies: (bootloader) :CLT-AL00 9.0.0.167(C00E55R1P15)
So I think I should downgrade system version "fastboot flash system system.img" seems working but version number doesn't change.

Not too sure, if you can get fastboot running via your pc then that is your best bet.

I've read about flashing the different components one at a time, there's a recovery thread here somewhere, take a look and see.

One thing I would say is to read before you commit. Make sure someone else in the same position has done it before.

 

[Sleipnirr]

Thanks to @oslo83 My phone is alive again, rebranded from CLT-AL00 to CLT-L29, working android 9 and receiving OTA updates. We use test point method to recover my phone.
I found where I made mistake and bricked my phone:
I use EMUIFlasher_1.0.apk to update Oreo (161) to Pie after rebrand. I choose CLT-LGRP2-OVS 9.0.0.247 to update but It was very big mistake. This file was Pie to Pie update which I learned later. After we recovered and came Oreo (161) again, this time I used "Huawei P20 Pro CLT-L29 CLT-L09 hw eu HLRCF Charlotte-L29C 9.0.0.195(C432E5R1P9T8)" to update Pie and everything go back to normal.

 

[colinlovesc]

Hi, NEWBIE needs HELP.
I got a China version CLT-AL00 from a friend as a gift which has been updated to PIE.
Luckily the bootloader unlocked service alive again. The Bootloader is been unlocked.

I follow the Sleipnirr’s experience to downgrade to 176. Going over OP and #152 again and again. Trying to download all the necessary files since OP’s google drive link dead already including 8.1.0.161(C432) files and Huawei P20 Pro CLT-L29 CLT-L09 hw eu HLRCF Charlotte-L29C 9.0.0.195(C432E5R1P9T8 .

After I root the phone with ramdisk-CLT-L29-MAGISK.img fastboot flash ramdisk CLT-L29-MAGISK.img and then flash and fastboot flash recovery_ramdisk recovery_ramdisk_nocheckP20.img, I installed the Magisk Manager. I got the unsupported Magisk Version. Is there any step I’m doing wrong? ( I didn’t install the TWRP, just unlocked phone, flash ramdisk CLT-L29-MAGISK.img then flash recovery_ramdisk_nocheckP20.img )

Thank you

 

[Ailing201904]

Hi, NEWBIE needs HELP.
I got a China version CLT-AL00 from a friend as a gift which has been updated to PIE.
Luckily the bootloader unlocked service alive again. The Bootloader is been unlocked.

I follow the Sleipnirr’s experience to downgrade to 176. Going over OP and #152 again and again. Trying to download all the necessary files since OP’s google drive link dead already including 8.1.0.161(C432) files and Huawei P20 Pro CLT-L29 CLT-L09 hw eu HLRCF Charlotte-L29C 9.0.0.195(C432E5R1P9T8 .

After I root the phone with ramdisk-CLT-L29-MAGISK.img fastboot flash ramdisk CLT-L29-MAGISK.img and then flash and fastboot flash recovery_ramdisk recovery_ramdisk_nocheckP20.img, I installed the Magisk Manager. I got the unsupported Magisk Version. Is there any step I’m doing wrong? ( I didn’t install the TWRP, just unlocked phone, flash ramdisk CLT-L29-MAGISK.img then flash recovery_ramdisk_nocheckP20.img )

Thank you

Maybe I can help u

 

[RoyalOrder]

P20 Pro Demo

Hey, did you find any more issues and Tweaks for the Demo version? I'm waiting and hoping for the Bootloader Unlock Keys to return.

 

[haggettam]

How do I get my bootloader unlock code? Will Huawei provide these anymore? I'm stuck in retail mode so want to root. Thanks

 

[mdda7]

3 months ago I debrand my p20pro from c185 to c432
Oem lock has become gray

I tried several method to update and could not yet

i need any help

 

[dladz]

3 months ago I debrand my p20pro from c185 to c432
Oem lock has become gray

I tried several method to update and could not yet

i need any help

Greyed out in what position?

I seem to recall a particular update that caused this.

The later updates changed it back. What firmware are you on

---------- Post added at 04:20 AM ---------- Previous post was at 04:20 AM ----------

How do I get my bootloader unlock code? Will Huawei provide these anymore? I'm stuck in retail mode so want to root. Thanks

I don't think anyone does them anymore. Huawei certainly doesn't.

 

[mdda7]

Greyed out in what position?

I seem to recall a particular update that caused this.

The later updates changed it back. What firmware are you on

---------- Post added at 04:20 AM ---------- Previous post was at 04:20 AM ----------



I don't think anyone does them anymore. Huawei certainly doesn't.

9.0.0.108

 

[dladz]

9.0.0.108

And have you looked it up? As in that symptom against that firmware?

 

[mdda7]

And have you looked it up? As in that symptom against that firmware?

I did not find any way to install any update

 

[dladz]

I did not find any way to install any update

No what I meant was I've seen this symptom where previously unlocked bootloaders and non greyed out OEM sections have suddenly changed due to an update, apparently it was one of the pie ones.

I've personally avoided pie, there is no reason to make the switch imho, the ROMs are better on Oreo and with the p20 pro, there is at least half a twrp working.

I'll be buying the OnePlus 7 on launch so will be saying good riddance forever to Huawei, they've seen my first and last purchase.

If I were you I would create a thread and search the p20 pro, p20, p20 lite, Honor view 10 threads for a suggestions.

Personally I think a future update will fix it.

By all accounts this can be done with a little tweaking, but be careful

---------- Post added at 04:45 PM ---------- Previous post was at 04:42 PM ----------

I did not find any way to install any update

Kind of like this

https://forum.xda-developers.com/huawei-p20-pro/how-to/upgrade-to-android-pie-throught-t3884054

But please, don't just dive in, read it all. Understand most if not all and ask if you're not sure.

 

[mdda7]

No what I meant was I've seen this symptom where previously unlocked bootloaders and non greyed out OEM sections have suddenly changed due to an update, apparently it was one of the pie ones.

I've personally avoided pie, there is no reason to make the switch imho, the ROMs are better on Oreo and with the p20 pro, there is at least half a twrp working.

I'll be buying the OnePlus 7 on launch so will be saying good riddance forever to Huawei, they've seen my first and last purchase.

If I were you I would create a thread and search the p20 pro, p20, p20 lite, Honor view 10 threads for a suggestions.

Personally I think a future update will fix it.

By all accounts this can be done with a little tweaking, but be careful

---------- Post added at 04:45 PM ---------- Previous post was at 04:42 PM ----------



Kind of like this

https://forum.xda-developers.com/huawei-p20-pro/how-to/upgrade-to-android-pie-throught-t3884054

But please, don't just dive in, read it all. Understand most if not all and ask if you're not sure.

Doesnt works in EMUI9

 

[dladz]

Doesnt works in EMUI9

Really? Ah that sucks. Is there anything similar? On the threads I mentioned?

 

[blitzcranky]

The link with the files is not working. Can someone update it or upload them again? Cheers!

 

[tegan1110]

Hi Guys,

Forgive my (possibly) dumb questions... BUT.... here goes...

I have had my P20 Pro on O2 UK for about 8 months. I believe it has some form of customisation from O2 as i have no settings to allow me to activate WiFi calling (perhaps because O2 dont support WiFi calling on this handset.

I have recently unlatched the handset from O2's Network and want to use a SIM from a network that DOES support WiFi Calling.

Are there any particular tricks that I need to do to my handset to "activate" the wifi-calling option in settings? Perhaps I need to flash a stock firmware or change a retailler code or something?

Help appreciated!

 

[Sebastian94]

OEM info

Ho guys, i Need rebrand my CLT-L09C55 to CLT-L09C432 eu. I have all files but i dont find "OEM info file .bin
Where can i find it?
Please help

 

[ooMoo]

I have a Mate 20X AL00 - could I re-brand to L29 using these steps? current firmware version = 9.1.0.123

 

[Kurocham]

I have a Mate 20X AL00 - could I re-brand to L29 using these steps? current firmware version = 9.1.0.123

x2