Oh, this thread is awesome. A huge thank you to SunsetCatcher!!!! My P3P had the No video transmission error, but the camera worked fine recording still and video to the card. I bought a new Wifi board and replaced it, but I still had the issue (no video downlink). I finally found this thread and went through all the steps in SunsetCatcher's manual and BOOM! I have video again.
For those that will attempt this fix... a few points of advice. This is very technical. You will need a half dozen micro solders under magnification. Also, the USB serial interface I used for the PC had 5v VCC and everything seemed OK, but it did not have enough amps (500ma) to fully power the board. I opted for an external power supply at 5.0vdc to the 5v pad on the board. Also, make sure your serial interface is set to 115200 baud, 8,1 -- I didn't see that mentioned earlier. Once I had good power and good serial settings the software worked like a charm. I put the files into a directory in the c:\ root, changed to that directory, and then executed the exe file command line.
My only concern now is when is it going to crap out again? It sounds like you need to power it up at least every month to keep it from getting corrupted.
Thanks again!!