Morning, PDP
I've shifted all the Posts about this from the general F3 Topic.
A few points:
Your F3 is not Plug and Play
You need to read the Readme that came with the bundle I sent
Then Download to your PC an earlier Version of Firmware than the one you were using
Then connect the F3 using a Null Modem Cable: It needs to go to a proper 9 pin Serial Port (eg on a PC), NOT via a USB Adapter.
Ensure the F3 Power is OFF ( Not Standby)
Then from the bundle run "config". Nothing much will appear to happen
Then run the actual programme "EROM Upgrade" in the bundle - This gives you a Setup screen where you check the Port etc (It should already be correct, as per the Readme, but if not is easy to Edit: If you can't establish the Com Port using Device Manager, just experiment as it'll only be 1, 2 or 3!))
Then point it to the F3 Firmware you want to flash with (Must be an earlier Version than you've been using) and tick "Include Bootloader"
When all this is done, it will sit there waiting for you to turn on the F3 Power and you'll then see it Flashing.
It's very easy and very quick to set up. The Flash itself took a couple of minutes, IIRC.
It doesn't necessarily work first time, so you may have to repeat a few times.
On completion, turn off F3 Power, disconnect Null Modem Cable and Reboot.
Upgrade Firmware as required
Restore your TP_Prog file that you will, of course, have Dumped to USB on a regular basis ,,,,,,,,,,,,,,,,,,
This is drawn from the deep recesses of my mind as it's a few months since I did it - but it was pretty easy, for sure.