I began to update my device (Mi 11 Pro) following the instructions step by step in
https://xiaomi.eu/community/threads/howto-install-fastboot-image-update-info-no-ota-download.64508/ but the updating did not complete. It suddenly stopped with the message "failed (write to the device failed), device do not support slots"
After rebooting PC and rebooting phone in fastboot mode, the update was finally succesful.
This problem also happened to me in the last weekly update. What is the mistake? I activated the USB debugging on developer mode before start updating, despite there is no mention of it in instructions. Could be that?