John-

Thank you for the update on the firmware, (MCU OTP(Microcontroller Unit, One Time Program only) . This explains the issue now well. I guess we cannot do anything about this. My problem with version 251 is it will not hold VFOs and bounce back and forth even when radio is in the lock mode. You may TX one minute on VFO A and next time TX on VFO B, wrong freq. This can be very embarrassing. Version 291 does not experience this problem. I sent you another PVT e-mail on this matter. Thanks 73's Ed - KB4VWA