Im looking for this fix too, i just followed the link and noticed this on the webpage
"As of 28 Dec 2022, DJI Firmware Tools does not support the Mini 3 Pro"
Bummer, Why not? Is there another way?
also note that my mini 3 pro also doesn't show...
I noticed several other errors including critical low battery, try to address those issues as well.
As far as the gimbal, try cleaning the gimbal with compressed air like from a computer component cleaner.
Gently rotate the gimbal by hand and...
There are several options on Amazon. The charger should meet the PD 3.0 (or greater) standard and should output a minimum of 100W through a single port. It is best to choose an established brand such as Anker.