Just spent 40 minutes connected to DJI Assistant2 upgrading firmware.
Program said upgrade successful (to .800).
Swapped batteries (all 5 of them) and each did upgrade.
Turned off Mavic. Closed DJI Asst.2
Re-turned on to check. All firmware latest.
Disconnect from PC.

Connect Android phone to RC.
Turned on RC & MP.
DJI GO4 starts up and asks me to update DMZ - go ahead and download & update.
Then GO4 tells me I don't have the latest firmware and prompts me to upgrade firmware.........
I believe it's just going to do a check, see it's latest and skip over it.....
:/

I'm now going through a complete firmware upgrade again....?!?
WTF!!
(Actually I think the AI in GO4 detected I had plenty of time on my hands and I really like watching the upgrade so thought it would give me a treat and do it again....  

I had to update my 2nd battery but the update process went really fast - so far everything is looking fine with x800