I am too novice - thus afraid to try and load a different firmware - but I read the code of the Ver. 4 Firmware and it is different, the V3 program seems much easier to work with - below are the differences my non computer self was able to find:
Menu: "Setup on?"
Menu: "Set Calibration?"
Print "Set to Zero-beat,"
Print "press PTT to save"
Menu: "Settings on?"
Menu: "Set Calibration"
If Button -
Print: "Press PTT & tune"
Print: "to exactly 10 MHz"
Then it goes into TX - and the PTT Delivers a sidetone -
Earlier I posted my method of listening on an IC 746, and transmitting the sidetone into a dummy load - which you can still faintly hear, and I matched the sidetone to the IC746 receive tone, I am pretty sure I am in the neighborhood and can hear SSB Stations but they sound like GARBAGE - so I am thinking my calibration and BFO are less of an issue then the Audio concerns I have been reading about with the V4.
I would love a post from someone about calibrating the V4 with the factory firmware - to see if I have a software bug of if I did it right!
Then I think I will look into the audio issues others have had.