[SOLVED!] How to change to official build? Build 8.0.0.046(070F) EMUI 8.0.0 - Huawei P20 Lite Questions & Answers

Hi guys,
i recently bought a Huawei P20 Lite on ebay. The device they send me has the System Firmware with the Build Number Build 0.0.0.046(070F). Since we all know that the p20 lite supports EMUI 9.1 i wanted to update the Firmware via system update. But no updates available. HiSuite also sais its allready up to date. Latest security patch is March 2018...
I reached out to the official Huawei support and they said to me:
"I have forwarded your ticket with case number SR3202108251214229RK to the specialist department and have already received feedback. Unfortunately, it is not possible for us to send you a software update as a push notification because your device 8.0.0.046(070F) has undergone a software manipulation. The P20 Lite has a custom ROM installed, so unfortunately you will not receive any support, not even from the French support team. I strongly advise you to use your right of withdrawal while you still have time to do so. Unfortunately, I cannot tell you if this is an isolated case with this retailer, but I would not recommend another purchase. "
My Question is: How can i change the Firmware to an official build to get Android 9 on the device.
Things i tried so far:
- Dload method didn't work. "Installation failed"
- HiSuite "allready up to date"
- erecovery doesnt find any official builds to install.
Is it possible to flash an official Firmware via Huawei Multi Download Software? Do i need an unlocked bootloader?
If i go in Bootloader screen it says "Phone locked"
Please help me otherwise i'll send this phone back...
Additional information:
Manufacture information: ANE_LX1_VF
Bootloader Version: Chipset-dallas8.0.0.046(070F)_FASTBOOT
Kernel Version: System 8.0.0.046(070F)_BOOT
Vendor:hw
Country:normal

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alexence said:
Hi guys,
i recently bought a Huawei P20 Lite on ebay. The device they send me has the System Firmware with the Build Number Build 0.0.0.046(070F). Since we all know that the p20 lite supports EMUI 9.1 i wanted to update the Firmware via system update. But no updates available. HiSuite also sais its allready up to date. Latest security patch is March 2018...
I reached out to the official Huawei support and they said to me:
"I have forwarded your ticket with case number SR3202108251214229RK to the specialist department and have already received feedback. Unfortunately, it is not possible for us to send you a software update as a push notification because your device 8.0.0.046(070F) has undergone a software manipulation. The P20 Lite has a custom ROM installed, so unfortunately you will not receive any support, not even from the French support team. I strongly advise you to use your right of withdrawal while you still have time to do so. Unfortunately, I cannot tell you if this is an isolated case with this retailer, but I would not recommend another purchase. "
My Question is: How can i change the Firmware to an official build to get Android 9 on the device.
Things i tried so far:
- Dload method didn't work. "Installation failed"
- HiSuite "allready up to date"
- erecovery doesnt find any official builds to install.
Is it possible to flash an official Firmware via Huawei Multi Download Software? Do i need an unlocked bootloader?
If i go in Bootloader screen it says "Phone locked"
Please help me otherwise i'll send this phone back...
Additional information:
Manufacture information: ANE_LX1_VF
Bootloader Version: Chipset-dallas8.0.0.046(070F)_FASTBOOT
Kernel Version: System 8.0.0.046(070F)_BOOT
Vendor:hw
Country:normal
Click to expand...
Click to collapse
Hello,
in fastboot mode run commands:
fastboot oem get-build-number
fastboot oem get-product-model
fastboot getvar vendorcountry
fastboot oem oeminforead-CUSTOM_VERSION
fastboot oem oeminforead-SYSTEM_VERSION
and post results.
alexence said:
Dload method didn't work. "Installation failed"
Click to expand...
Click to collapse
Which firmware?
alexence said:
Is it possible to flash an official Firmware via Huawei Multi Download Software?
Click to expand...
Click to collapse
Nope, it supports Huawei devices running on the Qualcomm Chipset (AFAIK).

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-Alf- said:
Which firmware?
Click to expand...
Click to collapse
i tried :
- Huawei P20 Lite ANE-LX1 ANE-L21 hw eu Anne-L21 8.0.0.150(C432) Firmware 8.0.0 r1 EMUI8.0 05014YWN [androidhost.ru]
- Huawei P20 Lite ( Nova 3e ) ANE-L21 ANE-L01 hw eu Anne-L01 9.1.0.370(C432E7R1P7T8) Firmware EMUI9.1.0 05014YXU [androidhost.ru]

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alexence said:
i tried :
- Huawei P20 Lite ANE-LX1 ANE-L21 hw eu Anne-L21 8.0.0.150(C432) Firmware 8.0.0 r1 EMUI8.0 05014YWN [androidhost.ru]
- Huawei P20 Lite ( Nova 3e ) ANE-L21 ANE-L01 hw eu Anne-L01 9.1.0.370(C432E7R1P7T8) Firmware EMUI9.1.0 05014YXU [androidhost.ru]
Click to expand...
Click to collapse
I'm not sure, but I think your device is a DEMO version
(Region C652 + hw/normal). Someone probably tried to do a rebrand , but unsuccessfully... Is your phone fully functional? What's your security patch date?

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-Alf- said:
I'm not sure, but I think your device is a DEMO version
(Region C652 + hw/normal). Someone probably tried to do a rebrand , but unsuccessfully... Is your phone fully functional? What's your security patch date?
Click to expand...
Click to collapse
Which funcions should i check?
So far everything worked fine:
calling, mobile internet, wifi, bluetooth, GPS worked
Security patch date is March 1st 2018

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i even did a benchmark with 3DMark and the results are similar to the results from the internet.

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alexence said:
Security patch date is March 1st 2018
Click to expand...
Click to collapse
With this patch you should be able to use DC-Unlocker and get bootloader unlock code.
If DC-unlocker will not be able to recognize your phone (due to the current system build 8.0.0.046), try installing the service ROM 8.0.0.142 (C652) using the dload method. Link
Or, try unlock the BL using PotatoNV method.

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Okay i'm kinda new to this all...
what will happen "if" i manage to unlock the bootloader?
im downloading the service rom right now.
if you say that the phone is a demo version of it... is it worth all the trouble or shouldn't i just refund it?
it will probably not be possible to refund it after all this alterations, will it?

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alexence said:
if you say that the phone is a demo version of it... is it worth all the trouble or shouldn't i just refund it?
Click to expand...
Click to collapse
DEMO devices are fully functional, except the ability to update, it's your choice...
alexence said:
it will probably not be possible to refund it after all this alterations, will it?
Click to expand...
Click to collapse
after all the successful alterations it will work perfectly

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-Alf- said:
after all the successful alterations it will work perfectly
Click to expand...
Click to collapse
with an official build and android 9 and recent safety patches?
if you say we can achive this then i will go for it

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alexence said:
with an official build and android 9 and recent safety patches?
if you say we can achive this then i will go for it
Click to expand...
Click to collapse
If you manage to unlock the bootloader, no problem.

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Allright Bootloader seems to be unlocked now.
Whats the next step?

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alexence said:
Allright Bootloader seems to be unlocked now.
Click to expand...
Click to collapse
Are you sure?

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well i get the warning message on boot up.
Fastboot says "PHONE Unlocked"

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i used DC unlock method

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alexence said:
i used DC unlock method
Click to expand...
Click to collapse
Okay, Chapter 1.:
- Downoload oeminfo.img
https://mega.nz/file/U4kjnaYR#RNj3zCLOGFoIO60XbVGBUeiES-pL6iUA1XwRbF4Zo7s
and copy it to SD Card
- Download TWRP
https://mega.nz/#!Fgd0xa4R!1o5ejzDnkLJLG2tAZG-STtlJ4nnNCHfwwZdOlmOkrVw
and copy it to SD & PC
- Download stock recovery
https://mega.nz/file/04dG0JBb#hEgTk6DMKVDffttHiXGqa_YR_zG5UYwTMEi41KTkZi8
and copy it to SD Card.
- Download Service ROM
https://androidhost.ru/2zMw
Unpack downloaded .zip package, and copy dload folder to the SD Card (without unpacking it! )
In Settings > Developer options enable OEM unlock, so in fastboot mode you will see Phone unlocked FRP unlock.
- In fastboot install TWRP, run
fastboot flash recovery_ramdisk TWRP-oreo-smart.img
fastboot reboot .
- Boot into TWRP and flash it over eRecovery :
-- select storage - SD Card, select "Install image", find TWRP file and mark eRecovery, swipe. Go back, find RECOVERY_RAMDISK-ANE-OREO file , mark Recovery, swipe. Reboot system, when yellow warning appears press and hold Volume Up.
- In TWRP select Install image and flash oeminfo.img file (mark oeminfo, swipe). Go back to main TWRP's menu, select Reboot > Power Off.
- Flash Service ROM using three buttons combo.
THE PROCESS WILL LOCK THE BOOTLOADER AGAIN!

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so i did everything as you said. and the last step didnt work :/
there is emui interface "Software install failed!" Imcompatibility with current version. Please download the correct update package.

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after the phone rebootet EMUI did a factory reset. bootloader seems to be locked hence there is no warning anymore.
edit: i just checked fastboot. Phone is locked again.

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phone in bootloop now