see if this makes sense:
your camera /quad is not operational as it sits with FW xyz
many suggest that updating everthing and reinstall app has good chance to fix--you argue
you WILL NOT update FW because you have read it may cause issues and can not return to FW you are NOW having issues with!
in summary
the one thing you will not do, is the one thing many say may fix it. and the reason you will not try is it may mess up your quad???
so what is it wont go back if it is BROKE.
Wow!
I do not really believe the FW is the problem. It was suggested to reload it in case it is. I can't.
It won't.
To satisfy yall. Against my better judgement, I just put 1.6 on the card. Fired it up with the reset button held in. Released when I heard the beep-beep. And....nothing. Cam goes limp. Continues beep-beep. It never begins the rapid beep-beep-beep indicating loading firmware.
So, the FW update/reload/rollback is now off the table as a possible fix. Its somehow loosing contact with the camera. And if it can't connect to the camera, it can't see the SD card.
I did manage to get GO to run long enough to get to the menu to try a gimbal cal. App said it was doing it. Gimbal sat like a limp noodle and never even twitched.
I am afraid at this point its either a mechanical failure or an electronic one. Neither of which I can fix.
One note, while the USB is plugged into the camera board, I get a drive letter in windows when it powers up but after maybe 5-10 seconds it disappears again. So I believe the subboard is either failing or shutting down due to an external signal or loss of signal.
And to answer and confirm the other question, yes, it looks like it would fly. I can CSC. Motors spin up and react to the throttle (no props). I get what appears to be consistant and likely accurate positioning data on the app confirming GPS as well as RC/P3 communication is all functioning.
So, it appears that this is a camera/gimbal issue. Either the hardware on the mainboard that talks to the camera is toast, the cables are toast, or the camera sub-board is toast. Maybe any or all.
I removed and re-inserted all the white/gray wire cables leading into the P3. I broke down and slipped out the ribbon cables from the connections on the camera and gimbal and reinserted those after wiping them with denatured alcohol. Nothing made any difference.
Even though the camera is limp and non-functional, the GO app reports "Normal" in the craft info screen. Which is BS because it aint.
So unless yall have any other ideas on this. I think its game over.