Here is the full procedure that I performed to reset my RC, upgrade to the latest FW and clear the "Upgrade Required" message.
First I applied this RC reset patch file by putting it on a pen-drive and updated the RC with it.
File is here
Then I turned off the RC, reconnected my ipad and restarted the RC,
The RC offered to download the latest FW file via the app and install it which I did (FW version 1.3.20)
After restarting the RC I had the dreaded "Upgrade Required" message, so I applied this patch file.
File is here
After restarting the RC I checked the "About" section to find the RC is now running on the latest FW.
I hope this is useful info for someone..