I'm in. I sent an email.
Got the firmware in zip file and uncompressed it. There are 7 files. Not sure if I load all 7 to the root of the mini 3. The broken English in both the email with the zip file and the reply to mine asking if I load all 7 files are vague. Simple yes/no question "Do I load all 7 files to root" got a vague answer. Don't want to brick the camera.