Have you formatted data in TWRP before flashing? This deletes all of your data on SD, but this must be when you come from stock ROMJust unlocked the bootloader of my mi 9t pro and install this version, but after flash the rom and reboot my device go back to twrp. Is there any additional step to install miui eu on k20pro/9tpro?
Your ADB command is wrong
Here is what you should do:recovery flashing and showing that a Fastboot restart entry is available and I hold the volume up button but are still not available in twrp.