I installed UT in my Device (Redmi Note 9Pro India) for the first time, few days ago. After some days, I required to copy some files from my PC to my Device. But I can't share or receive files from PC to my device and vice versa through USB. Hotspot is not working properly on my device so ftp or Wi-Fi transfer doesn't work and Bluetooth File Transfer eats a lot of time. So I can only share or receive files from my Pen drive and that's working good. But I wanted to make USB file transfer to work and when I use "adb" command on my pc,
adb devices
it always show me
List of devices attached
4df798d76f98cf6d unauthorized
and can't share files, So I searched on web, and watched tutorials to fix, but didn't worked..
At finally, I got an idea to format my Phone, surprisingly it worked.
Solution:
-To Factory reset Your Phone.
Step-1) Backup your Internal Storage or your important files to any storage like pen drive or to an SD Card or ANY.
Step-2) After taking a Backup, Power off your phone and Hold "VolumeUp+Powerbutton" simultaneously until your phone vibrates. It takes you to UBports Recovery(UT Recovery).
Step-3) You need to do all format options, Click Factory reset>Format data/factory rest>Format data.
Step-4) Then Click Factory reset>Format cache partition>Yes.
Step-5) Factory reset>Format system partition>Yes.
Step-6) And Finally "Reboot system now". Done...
Hopefully, it works to You...Thank you.....