Requirements:
Installing with Fastboot:
- Your device's bootloader must be unlocked.
Installing with TWRP:
- Download Xiaomi.eu ROM zip file
- Extract the ROM zip to a new folder
- Power off your device
- Boot your device in Fastboot mode (Hold volume down + power buttons)
- Connect to PC via USB cable
- Run one of the installation scripts (according to your PC operating system):
- install_and_format_data (or first_install_with_data_format) - with data wipe, if you're flashing Xiaomi.eu ROM for the first time or downgrading.
- install_upgrade (or update_rom) - without data wipe, if you're updating from an older Xiaomi.eu ROM.- Done!
(TWRP must be installed with Fastboot mode)
Updating via Updater app:
- Download Xiaomi.eu ROM zip file
- Reboot to TWRP
- If installing for the first time or downgrading: Wipe -> Format Data
- Copy the ROM zip file to the internal storage
- Install -> Select the ROM zip file
- Reboot to system
- Done!
(A Xiaomi.eu ROM and TWRP must already be installed on your device)
Remember:
- Download Xiaomi.eu ROM zip file
- Copy the ROM zip file to the internal storage
- Updater -> Menu (...) -> Select update package
- Select the ROM zip file
- Confirm any dialogs
- Done!
If you are going from HyperOS Weekly ROM to HyperOS Stable ROM, you are doing a downgrade, so format data is mandatory!
I performed the installation by formatting the data, as indicated. This way it worked. I don't know why it didn't work when I formatted it later.
Anyway, thanks!