I have also had problems uploading firmware. I used my laptop to install and try the experimental EQ\AZ firmware. This worked but I found various alignment issues so I decided to revert to the original firmware. I got repeated can't connect to motor board power off and retry message. I was tearing my hair out when out of desperation I decided to try the process on my wife's laptop. Bingo, it worked. However, the red led on the mount no longer flashes!
I have just tried to update to the latest firmware and had exactly the same problems using my laptop. Used the wife's and it ll worked smoothly. The LED still doesn't blink though.
I am guessing there is a corrupt wifi connection on my laptop although the firmware loader shows the installed mc version - it just won't update it. Anyone got any ideas? And why has the led stopped blinking?????