bluetooth and external storage

after upgrade to 9.10.17 -android 10 and miui11- i have some bluetooth issues, and my recovery can't read internal storage, now i have to flash with otg memory. can downgrade to 9.9.26, based on android 9 and miui10, or is possible to brick the phone? i have a mi9se 128 global. thanks

I can not add my watch as a trusted device to unlock my phone. The menu of trusted devices appears, the right one appears; but in the advanced screen unlock settings, when adding a device, neither my connected phone appears, nothing appears. And I can not plug my adapter pendrive into the...