[Huawei P20 Lite Questions & Answers] Pi0312:
Oright, I'm back in the game.

Thank you -Alf-, LR7875 and MrPipa

I too didn't manage to make the dload method work.

So I also followed Alf's suggestion to use Huawei Update Extractor.

Here is a recap for other noobs like me:

My device is:

Huawei P20 lite

Build: ANE-LX1 9.1.0.381 (C432E7R1P7)

vendorcountry: hw/eu

1. Download huawei update extractor here:

http://xdaforums.com/attachment.php?attachmentid=3966156

(from this thread: https://xdaforums.com/t/tool-huawei-update-extractor-updated-v0-9-9-5-open-source-library.2433454/)

2. Download Stock ROM from here: https://androidhost.ru/1O2r

(Thanks to -Alf-)

3. In windows, unzip HuaweiUpdateExtractor_0.9.9.5.zip

4. Unzip "Huawei P20 Lite ( Nova 3e )... .zip"

5. Unzip the update_sd.zip file contained in the folder path /Huawei P20 Lite ( Nova 3e ).../Software/dload/update_sd

5. Launch HuaweiUpdateExtractor.exe

6. Go in the tab settings and uncheck all boxes

7. Back to the first tab, leave the drop down field to "unknown ..."

8. Click on the 3 dots on the right side and select the file UPDATE.APP in the newly unzipped folder update_sd

9. HuaweiUpdateExtractor will show all the .img files contained in the UPDATE.APP file

10. Extract all to a folder (i.e. update-imgs) with right click on any img file and select extract all

11. Put the device in fastboot mode and start flashing .img files (see below)

(from this thread: https://xdaforums.com/t/huawei-p20-lite-bricked.3798842/)

Plug in usb cable into the pc and the device, boot the device into fastboot by pressing and holding Volume Down and power buttons, hold it until it boot into fastboot

Android icon with 2 red lines under it: bootloader unlock and FRP unlock

Then open a terminal or command line in the folder containing all the images i.e. update-imgs

and use these commands:

fastboot flash cust CUST.img
fastboot flash kernel KERNEL.img
fastboot flash recovery_ramdisk RECOVERY_RAMDIS.img
fastboot flash recovery_vbmeta RECOVERY_VBMETA.img
fastboot flash recovery_vendor RECOVERY_VENDOR.img
fastboot flash system SYSTEM.img
fastboot flash vbmeta VBMETA.img

I'm not sure if they are all necessary but I tried a few of them (system, recovery_ramdis, ramdisk)

and it didn't seem to work.

Only after doing the rest of them, it worked.

Meaning the device could boot into stock rom.

12. Reboot the device after the last command with:

fastboot reboot

Now back to normal.

After that I got LineageOS 16 on the device with these steps:

1. Download a TWRP, I used this one: https://mega.nz/#!Fgd0xa4R!1o5ejzDnkLJLG2tAZG-STtlJ4nnNCHfwwZdOlmOkrVw

(Thanks to -Alf-, from this thread: https://xdaforums.com/t/recommended-and-tested-twrp-recovery.4199099/)

2. Downlaod LineageOS 16 from here: https://lineageosroms.com/anne/

3. Copy the LineageOS 16 image to device's SD card.

4. Connect the device to a pc via USB cable, put the device in fastboot mode (Volume DOWN + Power buttons until the android icon appears)

then use this command line from the folder containing the TWRP image file (i.e. TWRP-oreo-smart.img):

fastboot flash recovery_ramdisk TWRP-oreo-smart.img

and reboot with:

fastboot reboot

5. To get into TWRP, unplug the USB cable and go into recovery mode by pressing and holding Volume UP + Power buttons until Huawei logo appears.

6. In TWRP:

(Again thanks -Alf-, from this thread: https://xdaforums.com/t/rom-official-anne-9-lineageos-16-0.4151163/page-3#post-83601729)

6.a: go to Wipe > Format data, go back to TWRP's main menu

6.b: Wipe > Advanced Wipe > Wipe Dalvik, Cache, Data, System, Internal storage > Swipe to wipe and go back to the TWRP's main menu

6.c: Install > navigate to LineageOS 16's .img file and swipe to install LineageOS

6.d: Back to TWRP's main menu, select Reboot > Reboot recovery > perform factory reset

That part didn't work for me, it kept booting into TWRP.

So I had to get into eRecovery from TWRP, I unplugged the USB cable.

And then pressed Volume UP + Power buttons until the phone rebooted and the Huawei logo appeared.

At the Huawei logo, I released the buttons and the device booted into eRecovery.

Then I could do a factory reset by following the onscreen instructions.

Done, the device reboots and after the Huawei logo appears the LineageOS animation.

Enjoy and again thank you -Alf-, LR7875 and MrPipa

Edit: Added flashing CUST.img as per -Alf- suggestion

Edit: Added remove the USB cable to boot into eRecovery