Joe
If indeed a calibration attempt is the cause, no need to refresh your v4 firmware code. Also let's presume the only thing you can easily corrupt there is the calibration.
Use your search engine to find k3pzn ubitx website. Its my local club. Clear instructions on v4 bfo calibration are there. Bfo cal is critical to receiving. Frequency cal does not matter as much except your operating frequency to a minor extent.
Caution is that bfo cal varies between models, hence my suggestion to visit k3pzn. Be patient,? once you adjust this its a huge step.
It would also help to know a bfo cal setting that is a good starting target for v4, can anyone identify this? I can't remember if that is in cal instructions.
Curt
