How to downgrade P20 Lite to a lower firmware - Huawei P20 Lite Questions & Answers

Hello
I'm trying to downgrade my P20 lite to a lower firmware because dc-unlocker is not working with the last one and I need to unlock my bootloader.
I've no idea if what I am trying to do is even possible, if it is not please stop me!
My model is ANE-LX1C432 (dual sim)
I downloaded an old firmware using the Firmware Finder, it the FullOTA-MF - 8.0.0.111
Here is the first question: I see 4 files, which one do I have to flash?
update.zip
update_data_full_public.zip
update_full_ANE-L21_hw_eu.zip
update_full_ANE-L01_hw_eu.zip
According to here the dual sim model is ANE-L21 but the firmware in that package is only ~117MB so I thing the right one is the one in the update.zip package
Second question: How do I flash it? I tried to open the zip file and put UPDATE.APP file in X:\dload\UPDATE.APP where X is the sd card but the updater says "Software install failed, Get help from http:/www.emui.com/emitiondownlad.php?mod=restore
I managed to open the UPDATE.APP file using HuaweiUpdateExtractor and got system.img and recovery.img and I could try to flash these but I'd love if somebody explains me how to do it
Thank you very much to anyone who will reply me.

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can you enter in enginering setings? usign *#*# 2846579#*#* code ?

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Arnys said:
can you enter in enginering setings? usign *#*# 2846579#*#* code ?
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Yes
I tried to use the "update from SD card" but it fails
I never tried to put the update in the internal memory, only SD card, is it worth a try?

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Brenza said:
Yes
I tried to use the "update from SD card" but it fails
I never tried to put the update in the internal memory, only SD card, is it worth a try?
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Click to collapse
i about your text here "because dc-unlocker is not working with the last one and I need to unlock my bootloader."
if you can enter in enginering setings, then you dont need to be problems to unlock bootloader with dc-unlocker (dont forgot, its 4 credits which you need to buy to be able to unlokc)
Just read all properly, how to use dc unlocker, please!

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Arnys said:
i about your text here "because dc-unlocker is not working with the last one and I need to unlock my bootloader."
if you can enter in enginering setings, then you dont need to be problems to unlock bootloader with dc-unlocker (dont forgot, its 4 credits which you need to buy to be able to unlokc)
Just read all properly, how to use dc unlocker, please!
Click to expand...
Click to collapse
I already went there and I already bought the credits but I've been told that the tool does not support the last firmware due to some new security measures
I hope I don't go against any rule but here is the discussion on their forum: https://forum.dc-unlocker.com/forum/dc-unlocker-support-forum/dc-unlocker-software/174384-issues-with-huawei-p20-lite-bootloader-code
My main goal is to install an app as system app
to do that i need root access
to gain root acces i need a custom recovery
to install twrp i need to unlock the bootloader
to unlock the bootloader i need dc-unlocker
for dc-unlocker to work i need to downgrade
Please stop me if I am somewhere wrong, this is getting intense quite time consuming :crying:

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oh, didnt know.. there are dload packages: link here, russina site , latest for ane l21 c432 (need to search ane-l21 and scroll down) i found was b136 3,2 gb, shuld work with dload folder, have not tested, but @Merlin_99 said its worked for him, here his post : https://forum.xda-developers.com/huawei-p20-lite/how-to/root-how-to-install-update-t3841557
specialy for you serched this post like 40 mins in xda. lost so much time here :/
on ane-l21c432 you dont need root acces to instal app as system. you need unlocked bootloader, instaled twrp, adn here you can put your app in (mount system first in twrp) system>>priv-app folder and after reboot aplication will be as system app, done it with privacy mode in the app ninjas joystick to spoof pokemons (if spoof localy then all are ok (like 7 monts spoofing and no wraning, etc (but i dont jump globaly, i stay at contry my ip shows))

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Arnys said:
oh, didnt know.. there are dload packages: link here, russina site , latest for ane l21 c432 (need to search ane-l21 and scroll down) i found was b136 3,2 gb, shuld work with dload folder, have not tested, but @Merlin_99 said its worked for him, here his post : https://forum.xda-developers.com/huawei-p20-lite/how-to/root-how-to-install-update-t3841557
specialy for you serched this post like 40 mins in xda. lost so much time here :/
on ane-l21c432 you dont need root acces to instal app as system. you need unlocked bootloader, instaled twrp, adn here you can put your app in (mount system first in twrp) system>>priv-app folder and after reboot aplication will be as system app, done it with privacy mode in the app ninjas joystick to spoof pokemons (if spoof localy then all are ok (like 7 monts spoofing and no wraning, etc (but i dont jump globaly, i stay at contry my ip shows))
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I don't know how to thak you, it worked!
I've been trying for 2 days, it seems that the packages from Firmware Finder did not have the right filenames and also made mistakes while putting them on the memory card.
anyway the package from that site worked and i was able to obtain the code!!!
I used the package HUAWEI P20 LITE ANNE-L01 ANE-L01 + ANE-L21 8.0.0.125(C432) FIRMWARE ANDROID 8.0.0 EMUI 8.0.0 05015ACP ANDROIDHOST.RU.ZIP

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Brenza said:
I don't know how to thak you, it worked!
I've been trying for 2 days, it seems that the packages from Firmware Finder did not have the right filenames and also made mistakes while putting them on the memory card.
anyway the package from that site worked and i was able to obtain the code!!!
I used the package HUAWEI P20 LITE ANNE-L01 ANE-L01 + ANE-L21 8.0.0.125(C432) FIRMWARE ANDROID 8.0.0 EMUI 8.0.0 05015ACP ANDROIDHOST.RU.ZIP
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Click to collapse
what files you put on sd card? zip file, or unziped files?

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Arnys said:
what files you put on sd card? zip file, or unziped files?
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Click to collapse
I just copy-pasted the content of the Software package exactly lite it came with the package
F:\dload\update_sd.zip
F:\dload\ANE-L01_hw_eu
F:\dload\ANE-L21_hw_eu
F:\dload\ANE-L01_hw_eu\update_sd_ANE-L01_hw_eu.zip
F:\dload\ANE-L21_hw_eu\update_sd_ANE-L21_hw_eu.zip
The files from the firmware finder had other names and i found no indication that i had to create any subfolder
Again I'm quite new to the android world so I do not exclude I missed something basic there.
The files from ff had these names and no folder structure
update.zip
update_data_full_public.zip
update_full_ANE-L01_hw_eu.zip
update_full_ANE-L21_hw_eu.zip