Hi, for Information
i flashed my Mi11 Ultra China Version 12.5.2 direct to latest EU 21.4.21 weekly as well with this instruction below and it worked:
after bootloader unlock i did initial setup and factory reset.
C:\tmp\Xiaomi\xiaomi.eu_multi_MI11Pro_MI11Ultra_21.4.21_v12-11-fastboot\platform-tools-windows>fastboot getvar current-slot
current-slot: b
Finished. Total time: 0.002s
C:\tmp\Xiaomi\xiaomi.eu_multi_MI11Pro_MI11Ultra_21.4.21_v12-11-fastboot\platform-tools-windows>fastboot set_active a
Setting current slot to 'a' OKAY [ 0.034s]
Finished. Total time: 0.036s
D88411101 said:
Successed to flash 11U from 12.5.2CN to 12.5.2 EU and my step as below...
1. Login Miflash tool
2. Setting phone to Fastboot mode
3. Unlocked phone and reboot
4. Quick setting and makesure can login to phone
5. Setting phone to Fastboot moda again
6. Open CMD as administrator
7. Go to folder platform-tools-windows as keying command
fastboot devices > check phone already link with PC
fastboot getvar current-slot > check slot is a or b, and my device show the slot on b
fastboot set_active a > change the slot from b to a
8. Back to extract file folder and keying command
windows_fastboot_first_install_with_data_format.bat
9. Auto reboot phone when finished and successed.
My phone was on slot b as well and i changed the slot to a. everythint went fine! Thank you!!