开云体育

After a lont time of using my Bitx40 with Allard's 1.09 firmware I decided today to upgrade to the latest version 1.27.7
No hardware modifications have been implemented except for the Function switch that was installed when switching to 1.09.
With the new firmware (1.27.7) I cannot save my calibration. After I power OFF and again ON I get the same message, unit not calibrated, so I have to go through the steps of setting LSB calibration, USB calibration, VFO drive levels, etc. and the starting frequency is VFO A = VFO B = 7.1250 MHz.
Initially I thought there was something wrong with the Nano (EEPROM issues), but reverting back to 1.09 everything is back to normal and the calibration values are retained.
Any one had the same experience? What did you do to make it work?
Do I need to make any hardware modifications in order to have the radio retain the calibration?
Thank you in advance,
--
Ion

VA3NOI