MIX 4 unlocked bootloader on official stable 12.5.7, flashed xiaomi.eu_multi_MIX4_21.9.8_v12-11-fastboot. Clean flash, using "windows_fastboot_first_install_with_data_format.bat"
can't log in to google. It says "Checking info..." then "couldn't sign in. There was a problem communicating with...