I have three miboxes. Two updated no problem with the OTA that says "adds audio menu and fixes wifi issues. The third now freezes during the animated Android letters or gets to the "Android" in white font and freezes. It freezes at different points in the boot process.
It's the newest of the three, perhaps three months old.
Is it bricked, or is there a way to use the USB to recover it without being able to access any recover menu since it won't do any successful boot?
manual update process detailed here
strongly suggest you stick with build 2179
build 2303 can lead to unexpected 'adventures'
https://www.reddit.com/r/AndroidTV/comments/9fo34b/xiaomi_mdz16ab_solution_to_downgrade_from_flaky/