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[Firmware] EMUI 8.1 / 9.0 Flash, Root and Downgrade Guide (L29C432/L29C636)

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silverstream

Senior Member
Sep 24, 2009
759
70
you probably can use OTG , or push/sideload the magisk uninstaller to /cache partition

I think i might have a problem with leftover magisk modules causing bootloop with Magisk 19.1.

How do I uninstall by sideloading into /cache? Run the zip file from twrp after I place into cache?

But my data and system are still encrypted, how will uninstaller work?

UPDATE: Fixed by touching/creating a .disable_magisk file in /cache. It boots now
 
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zencooler

Senior Member
Jul 9, 2008
788
247
Bricked my CLT-L29 when tried to downgrade from B195 to B159 using this method :(((
Now there is a black screen only (with fastboot available when connected to PC). No eRecovery, No reaction for power key etc.

Information I can get via fastboot commands:
C:\ADB>fastboot oem get-product-model
...
(bootloader) CLT-L29
OKAY [ 0.003s]
finished. total time: 0.003s

C:\ADB>fastboot oem get-build-number
...
(bootloader) :CLT-L29 9.0.0.195(C432E5R1P9)
OKAY [ 0.002s]
finished. total time: 0.002s

C:\ADB>fastboot getvar vendorcountry
vendorcountry: hw/eu
finished. total time: 0.002s

C:\ADB>fastboot getvar rescue_enter_recovery
getvar:rescue_enter_recovery FAILED (remote: FAIL:need all image flashed!)
finished. total time: 0.017s

C:\ADB>fastboot oem oeminforead-SYSTEM_VERSION
...
(bootloader) :CLT-L29 9.0.0.195(C432E5R1P9)
OKAY [ 0.003s]
finished. total time: 0.003s

I put this info as a warning for anybody to be very carefull and not to try downgrade...
Hard brick with no screen, it's the end of the story. Any tries to flash cust, cache, system, recovery_ramdisk via fastboot and clearing userdata don't help.
 

blackst225

Senior Member
Jan 7, 2013
164
29
Overath
Bricked my CLT-L29 when tried to downgrade from B195 to B159 using this method :(((
Now there is a black screen only (with fastboot available when connected to PC). No eRecovery, No reaction for power key etc.

Information I can get via fastboot commands:
C:\ADB>fastboot oem get-product-model
...
(bootloader) CLT-L29
OKAY [ 0.003s]
finished. total time: 0.003s

C:\ADB>fastboot oem get-build-number
...
(bootloader) :CLT-L29 9.0.0.195(C432E5R1P9)
OKAY [ 0.002s]
finished. total time: 0.002s

C:\ADB>fastboot getvar vendorcountry
vendorcountry: hw/eu
finished. total time: 0.002s

C:\ADB>fastboot getvar rescue_enter_recovery
getvar:rescue_enter_recovery FAILED (remote: FAIL:need all image flashed!)
finished. total time: 0.017s

C:\ADB>fastboot oem oeminforead-SYSTEM_VERSION
...
(bootloader) :CLT-L29 9.0.0.195(C432E5R1P9)
OKAY [ 0.003s]
finished. total time: 0.003s

I put this info as a warning for anybody to be very carefull and not to try downgrade...
Hard brick with no screen, it's the end of the story. Any tries to flash cust, cache, system, recovery_ramdisk via fastboot and clearing userdata don't help.

Have you try to flash stock ram disk from the version you come from? Try to boot in erecovery then. Or try to connect in adb mode on huawei suite on PC to recover..

If you try to flash the original ram disk be sure to type fastboot reboot afterwards and then quick disconnect the USB c cable and hold Vol up for long time to boot in erecovery
 
Last edited:
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zencooler

Senior Member
Jul 9, 2008
788
247
Have you try to flash stock ram disk from the version you come from? Try to boot in erecovery then. Or try to connect in adb mode on huawei suite on PC to recover..

If you try to flash the original ram disk be sure to type fastboot reboot afterwards and then quick disconnect the USB c cable and hold Vol up for long time to boot in erecovery
Of course. Every this methods has been tested. As I wrote it's bricked and no eRecovery and no ADB. So each of standard way is not working. Of course also Hisuite can not do anything. Just says that it cannot restore system on this phone. And it's true as bootloader is corrupted.
Be careful with idea of downgrading from Pie to Oreo as it will finish like in my case.

Sent from my SM-N960F via Tapatalk
 

blackst225

Senior Member
Jan 7, 2013
164
29
Overath
Of course. Every this methods has been tested. As I wrote it's bricked and no eRecovery and no ADB. So each of standard way is not working. Of course also Hisuite can not do anything. Just says that it cannot restore system on this phone. And it's true as bootloader is corrupted.
Be careful with idea of downgrading from Pie to Oreo as it will finish like in my case.


Im sorry that's really bad:(
 

EHKing

Member
Jul 4, 2014
43
5
Flash Magisk 18.2 with the link given a few pages before.
It's very easy and it works perfectly

Step by step how to root b270:
install Magisk Manager v7.1.1 apk
download patched_boot.img here:
https://drive.google.com/open?id=1CJHrHfyAAx1wYWp8oRzmfq0L-buTRjHX
Reboot device to fastboot mode and flash patched_boot.img using command:
fastboot flash recovery_ramdisk patched_boot.img
Now issue command fastboot reboot. Quickly unplug USB cable and hold vol-up button. Now your device will be booted in to rooted ROM
Enjoy

Hi, fastboot says this when I try to flash your custom .img:

PS C:\adb> fastboot flash recovery_ramdisk patched_boot.img
target reported max download size of 471859200 bytes
sending 'recovery_ramdisk' (32004 KB)...
OKAY [ 0.831s]
writing 'recovery_ramdisk'...
FAILED (remote: Command not allowed)
finished. total time: 0.844s

What can I do? I have OEM and debugging mode activates
 

otonieru

Senior Member
May 7, 2011
3,442
2,208
Djakarta
Hi, fastboot says this when I try to flash your custom .img:

PS C:\adb> fastboot flash recovery_ramdisk patched_boot.img
target reported max download size of 471859200 bytes
sending 'recovery_ramdisk' (32004 KB)...
OKAY [ 0.831s]
writing 'recovery_ramdisk'...
FAILED (remote: Command not allowed)
finished. total time: 0.844s

What can I do? I have OEM and debugging mode activates

but is your bootloader unlocked ?
 

smohanv

Senior Member
Nov 5, 2006
2,108
641
Higham, Rochester, Kent
Hi Guys

This question is out of interest. New firmware flashers (totally clean flash) can confirm this. We all are aware that Google has discontinued its support to all Huawei devices. HGow does it affect when we do a CLEAN FLASH (i.e wiping data, system and everything). Does the setup go through asking google acticvation.

Thanks.
 
Last edited:

ahac85

Senior Member
Aug 7, 2010
1,583
246
Bricked my CLT-L29 when tried to downgrade from B195 to B159 using this method :(((
Now there is a black screen only (with fastboot available when connected to PC). No eRecovery, No reaction for power key etc.

Information I can get via fastboot commands:
C:\ADB>fastboot oem get-product-model
...
(bootloader) CLT-L29
OKAY [ 0.003s]
finished. total time: 0.003s

C:\ADB>fastboot oem get-build-number
...
(bootloader) :CLT-L29 9.0.0.195(C432E5R1P9)
OKAY [ 0.002s]
finished. total time: 0.002s

C:\ADB>fastboot getvar vendorcountry
vendorcountry: hw/eu
finished. total time: 0.002s

C:\ADB>fastboot getvar rescue_enter_recovery
getvar:rescue_enter_recovery FAILED (remote: FAIL:need all image flashed!)
finished. total time: 0.017s

C:\ADB>fastboot oem oeminforead-SYSTEM_VERSION
...
(bootloader) :CLT-L29 9.0.0.195(C432E5R1P9)
OKAY [ 0.003s]
finished. total time: 0.003s

I put this info as a warning for anybody to be very carefull and not to try downgrade...
Hard brick with no screen, it's the end of the story. Any tries to flash cust, cache, system, recovery_ramdisk via fastboot and clearing userdata don't help.

Did you manage to fix your phone, I'm in the exactly the same situation?
 

kessaras

Recognized Developer
Sep 28, 2013
4,666
9,445
36
Athens
www.audioshow.gr
i see that we still get updates.
https://androidhost.ru/1L3J
but which country is AMH that still releases updates ?

Hi Guys
This question is out of interest. New firmware flashers (totally clean flash) can confirm this. We all are aware that Google has discontinued its support to all Huawei devices. HGow does it affect when we do a CLEAN FLASH (i.e wiping data, system and everything). Does the setup go through asking google acticvation.
Thanks.
i clean flash almost every day.
No Google didn't ban the current devices that way.
- Google banned huawei from using Gapps and their Android to bring a new firmware for a new device. Current devices can still get an EMUI update if huawei decides to update.
- Facebook banned huawei from installing fb related apps in system , so fb related apps won't come preinstalled in stock OS on newer firmwares.
As a result a newer device stock firmware will not go through the initial google setup wizard.
 
Last edited:

dicht`

Member
Nov 26, 2013
23
4
Hi, I'm having some trouble updating to 195.

I downloaded CLT-L29C432E5R1P9B195 (9.0.0.195) from FW Database - link in first post.
Put both files - update.zip & update_full_CLT-L29_hw_eu.zip - in to ZIPS-HERE folder.
Because there is already a file called "update.zip" I didn't rename any of those two files.
Using FLASH_two_files.bat gives me always the Missing file error - !!! Missing ZIP files or you have not renamed ZIP file as per this flash guide!!!

My current FW is CLT-L29 8.1.0.156(C432).

Would really appreciate any help.
 

zencooler

Senior Member
Jul 9, 2008
788
247
Hi, I'm having some trouble updating to 195.

I downloaded CLT-L29C432E5R1P9B195 (9.0.0.195) from FW Database - link in first post.
Put both files - update.zip & update_full_CLT-L29_hw_eu.zip - in to ZIPS-HERE folder.
Because there is already a file called "update.zip" I didn't rename any of those two files.
Using FLASH_two_files.bat gives me always the Missing file error - !!! Missing ZIP files or you have not renamed ZIP file as per this flash guide!!!

My current FW is CLT-L29 8.1.0.156(C432).

Would really appreciate any help.
You have to rename both files according to the manual. It's must. If you have other files in this folder you can just delete them and then copy your new files and rename them. That's all.

Sent from my SM-N960F via Tapatalk
 
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  • 42
    How to FLASH EMUI 8.1 / 9.0 including latest single base versions (build 197+)

    Your device must have the following
    1. Bootloader should be unlocked (if you have not already unlocked bootloader, there are paid services available)
    2. Enable USB debugging in Settings > Developer options > USB debugging
    3. Remove Fingerprint ID, Face lock and Lock screen password. This is very very important otherwise your device will be soft bricked

    Firmware Download:
    You can download ROM version that you want (EMUI 8.1 / 9.0) from this LINK

    If you do not see latest EMUI 9.0 firmwares, use the links below,
    EMUI 9.0 Build 204
    EMUI 9.0 build 236
    EMUI 9.0 build 241
    EMUI 9.0 build 243
    EMUI 9.0 build 251

    Do not try to update to build 241 straight from EMUI 8.0. It will brick your device and you will end up with black screen. Update to build 195 and then update to any later builds.

    Files that you will be downloading are,
    >> Upto build 195
    update.zip
    update_full_CLT-L29_hw_eu.zip

    >> After build 197 or later
    update_full_base.zip

    Preparation:
    a. Download this Flash tool and extract to your PC
    b. Copy downloaded Firmware files to ZIPS-HERE folder (you can find this folder where you have extracted Flash tool

    How to flash Firmware
    1. Double click to run the file cmd-here.exe. It opens command prompt in the same folder where you are.
    2. Once command prompt opens, type FLASH_two_files.bat if you have multiple Firmware files (2 files) or FLASH_full_base.bat if you have single base file from latest EMUI 9.0. Follow steps carefully. Once flashing is complete, it will boot normally.

    PLEASE NOTE THAT THIS METHOD OF FLASHING DO NOT WIPE DATA and all the installed apps will be intact. But you will loose ROOT. You have root again.

    How to ROOT EMUI 8.1 / EMUI 9.0
    For EMUI 8.1:
    1. Download this TWRP and flash it in fastboot mode
    2. Download Magisk from this LINK
    3. Flash in TWRP (using the command fastboot flash recovery_ramdisk images/twrp.img). twrp.img is already in the Flash tool that you downloaded.

    For EMUI 9.0: Thanks to @ArtaxXP for the findings and the post is here LINK
    1. Pre-patch images you need for different version are below. You will be patching this file yourself with magisk canary version.
    RECOVERY_RAMDIS_163.img
    RECOVERY_RAMDIS_195.img

    RECOVERY_RAMDIS_9.0_204.img
    RECOVERY_RAMDIS_9.0_236.img
    RECOVERY_RAMDIS_9.0_241.img
    RECOVERY_RAMDIS_9.0_243.img
    RECOVERY_RAMDIS_9.0_251.img

    and copy this img to your device (these recovery_ramdisk file extracted from respective EMUI firmware UPDATE.APP)
    2. Download and Install latest magisk manager
    3. Open Magisk manager, go to settings > update channel > Custom and use the link below
    4. Go back to magisk manager default page and refresh (pull down). Install the latest magisk manager version when prompted. Now open magisk manager after installing the updated version and again pull down to refresh
    5. Now you will be asked to download and flash the latest magisk version. Click on Install and when the next window comes choose "patch only the boot.img" option. Choose the image file that you have downloaded from the link in step 1 above
    6. Wait until patching is complete. The patched image will be found in Download folder in your device. Copy this patched_boot.img to your PC in the same folder where you have extracted the Flash tool you used to flash the ROM
    7. Reboot device to fastboot mode and flash patched_boot.img using
    fastboot command ===> fastboot flash recovery_ramdisk patched_boot.img
    8. Now issue command fastboot reboot. Quickly unplug USB cable and hold vol-up button. Now your device will be booted in to rooted ROM

    Careful Note:
    If you reboot your device normally, it boots in to non-rooted ROM.

    To boot to rooted ROM, hold vol-up button until Huawei Logo appears while booting.

    IF YOU HAVE PATCHED WITH LATEST MAGISK CANARY BUILD 18.2+, THEN YOU DON'T HAVE TO HOLD VOL UP BUTTON WHEN REBOOTING. JUST POWER YOUR DEVICE NORMALLY AND IT BOOTS IN TO ROOTED ROM

    How to DOWNGRADE from EMUI 9.0 to EMUI 8.1 for ROOTED EMUI
    1. Remove fingerpring, disable screenlock & password and app lock in Settings / Security & privacy. If you miss this step your device will be soft bricked.

    2. Download from here / extract yourself EMUI 9.0 recovery_ramdisk from UPDATE.APP
    RECOVERY_RAMDIS_195.img (EMUI 9.0 release 11.01.2019)

    3. Flash this RECOVERY_RAMDIS_195.img in fastboot and restart your device normally.
    Your device may boot in to eRecovery. Switch off and restart in to fastboot and flash this RECOVERY_RAMDIS_195.img again in fastboot

    4. Folllow the steps explained in How to Flash section.

    How to DOWNGRADE from EMUI 9.0 to EMUI 8.1 for Non-ROOTED EMUI
    Folllow the steps explained in How to Flash section.



    GENERAL TWEAKS
    AdGuard DNS:
    You can read here what is DNS and the goodies of changins it https://www.maketecheasier.com/best-alternate-dns-services/

    If anyone wants to change DNS AdGuard which stops ads in browsing. Flash it in magisk. I have done two versions. Default version blocks ads but allows browsing explicit sites and Family Protection block every ads and also explicit contents.
    Files attached are,
    AdGuard_DNS_(Default).v0.zip
    AdGuard_DNS_(Family_Protection).v0.zip

    Removal of Apps via ADB command:
    If anyone wants to remove bloatware (that you may consider bloat) follow the steps below,
    Note: This command doesn't remove the app altogether from your device. It removes the app from the default user 0. To get the apps back, just factory reset your device.
    1. Download and unzip ADB files [Link]
    2. Make sure that you have enabled USB debugging from Settings / System / Developers options [google search and find how to enable Developer option]
    3. Connect your phone to your PC. Go to the folder where you have extracted the file downloaded from step 1 above
    4. Double click to run the file cmd-here.exe. It opens command prompt in the same folder where you are
    5. Run the command, adb shell
    6. Now you can start debloating the apps that you want to (see commands below)
    pm uninstall -k --user 0 com.google.android.youtube [YouTube]
    pm uninstall -k --user 0 com.android.egg [Easter Egg]
    pm uninstall -k --user 0 com.huawei.gameassistant [Playstore Game]
    pm uninstall -k --user 0 com.huawei.appmarket [Huawei App market]
    pm uninstall -k --user 0 com.android.chrome [Google Chrome]
    pm uninstall -k --user 0 com.google.android.apps.docs [
    pm uninstall -k --user 0 com.google.android.apps.tachyon [Duo]
    pm uninstall -k --user 0 com.android.email [Stock email]
    pm uninstall -k --user 0 com.google.android.gm [Gmail]
    pm uninstall -k --user 0 com.google.android.videos [Google Play Videos]
    pm uninstall -k --user 0 com.google.android.music [Google Music]
    pm uninstall -k --user 0 com.huawei.health [Huawei Health app]
    pm uninstall -k --user 0 com.huawei.phoneservice [HiCare customer service app]
    pm uninstall -k --user 0 com.android.soundrecorder [Stock sound recorder]
    pm uninstall -k --user 0 com.huawei.hifolder [App Advisor]
    pm uninstall -k --user 0 com.android.mediacenter [Huawei Music app]
    pm uninstall -k --user 0 com.huawei.himovie.overseas [Huawei Video player]
    pm uninstall -k --user 0 com.huawei.videoeditor [Huawei video editor]
    pm uninstall -k --user 0 com.huawei.aod [Always on display]
    pm uninstall -k --user 0 com.android.dreams.basic [Daydream]
    pm uninstall -k --user 0 com.android.calculator2 [stock calculator]
    pm uninstall -k --user 0 com.facebook.system [Facebook App Installer]
    pm uninstall -k --user 0 com.facebook.appmanager [Facebook App manager]
    pm uninstall -k --user 0 com.facebook.services [Facebook Services]
    pm uninstall -k --user 0 com.huawei.android.FloatTasks [Navigation dock]
    pm uninstall -k --user 0 com.huawei.livewallpaper.paradise [Paradise Wallpaper]
    pm uninstall -k --user 0 com.huawei.android.thememanager [Themes]

    If anyone find more debloats please share in this thread

    Few debloats submitted by @moonshiner
    pm uninstall -k --user 0 com.huawei.search
    pm uninstall -k --user 0 com.huawei.hwid
    pm uninstall -k --user 0 com.huawei.hitouch
    pm uninstall -k --user 0 com.huawei.hidisk [files explorer]
    pm uninstall -k --user 0 com.huawei.compass
    5
    Hi @smohanv

    i managed to update my C636 P20 Pro to .201 using the new full base .zip

    procedure was changed, it's easier now though. You might want to update the OP (or make it sectional, split between old method and new method)

    Here's the method :
    Pre-Requisites : ROOT

    1. Download EMUI Flasher from HERE (courtesy of @OldDroid) - Dont worry, the app is clean and clean
    2. Download the Latest Approved Update_full_base.zip of your phone model from FF
    3. Open the App, choose the firmware zip you already download. If the app prompt to install some assets, approve it, it need to re-install stock recovery back.
    4. Ignore the second firmware file option
    5. Tap the "Flash Button" on the bottom right corner
    6. Wait till phone boot to recovery, flashing update and finish.
    7. Optional - Re-ROOT using your patched recovery ramdisk
    3
    Hi @smohanv

    i managed to update my C636 P20 Pro to .201 using the new full base .zip

    procedure was changed, it's easier now though. You might want to update the OP (or make it sectional, split between old method and new method)

    Here's the method :
    Pre-Requisites : ROOT

    1. Download EMUI Flasher from HERE (courtesy of @OldDroid) - Dont worry, the app is clean and clean
    2. Download the Latest Approved Update_full_base.zip of your phone model from FF
    3. Open the App, choose the firmware zip you already download. If the app prompt to install some assets, approve it, it need to re-install stock recovery back.
    4. Ignore the second firmware file option
    5. Tap the "Flash Button" on the bottom right corner
    6. Wait till phone boot to recovery, flashing update and finish.
    7. Optional - Re-ROOT using your patched recovery ramdisk

    Just a little note: EMUIFlasher can be used also with unapproved firmwares.

    Regards
    3
    i should open an application thread to provide exact infos.
    The app has been programmed to work with EMUI8 AND EMUI9.

    Regards
    2
    Is debranding necessary to flash this ROM? I'm on CLT-L04 8.1.0.109(C792), been learning Huawei's intricacies but still not understanding the debranding thing and keep hearing it tossed around. Are the ROMs themselves region locked or something?

    Yes you do. You need to debrand.. Search for the thread in this Forum. You have to debrand to C432. Check your version from settings.