[moolight0551]

Don't know if I can give much help with this one... I suppose that when you say Arduino Mega you are referring to the Meduino Mega used on the Pro2 PLUS, right?
If yes, and you have removed the diode has recommended, them the Meduino, can only be programmed inserted on the Pro2 PLUS board and with the board powered.

There are many reasons for this error come up, and it doesn't necessarily means that your Mega is damaged.
If possible try with another computer

Rgs.
Werk_AG

Yes Meduino Mega, diode is removed and trying to program while plugged in the the Rx board. Will try another computer and see if I can get it to upload. Did not have this problem when I first programmed the RX Plus but I see a few posts on the Arduino forum about timing issues and about the Meduino version. Thanks for your reply.

Dave

I will reply to this issue just in case it helps someone else with the timeout problem. I never really solved it but bought two new Meduino Megas from China and used one and it compiled and accepted the software with no problems. Now my date problem is fixed and its no longer the 117th January 2021 on my RX Plus.   I tried different computers with the Arduino IDE previously but could never get the original Meduino Mega, or a spare I bought at the same time, to enter programming mode. One of those mysteries and not worth losing sleep worrying about why. Thanks Werk_AG for your support. Cheers  Dave