How to update Huawei Mate 20 Pro With Locked Bootloader

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Because I see a lot of confusion about an update of Huawei Mate 20 Pro I will post How to update the Mate with Locked bootloader:

First Make a Backup all data will be deleted and you will start fresh!!!!!!!

After that download this firmware for EU LYA-L29 C432:

If you have LYA-L09:

After That extract the firmware and put in a USB stick ( no need to create dload folder already exist in unzipped folder)

Mount an otg USB to your phone then the USB drive

Then dial in phone *#*#2846579#*#* and go to Software Update and then select USB upgrade.

Have a nice upgrade!!!!

Source: XDA