Calibration

[VesaOskari]

I have read that each individual radio have its own factory written calibration values (tuning?). I have understood that this unique calibration data is between 0x1e00 and 0x2000.

In this page it is written that Egzumer firmware does not overwrite this calibration data.
#134

The size of Egzumer is about 60K. How is it possible that the firmware does not destroy this original calibration data and have effect on performance?

[prokrypt]

Firmware is stored on flash memory built into the microprocessor. Radio config (channels, etc) and calibration are stored on external eeprom.

[VesaOskari]

That makes sense. EEPROM and flash memory are two different things.

I have a linux PC and want to be sure I do a full backup before changing the firmware. K5prog will do that, I think.

So to backup the configuration and calibration on eeprom I would use
k5prog -r -v

Can I backup the current firmware like this?
k5prog -b -v

After making these backups I would use the flatpak version of Chromium to flash the new firmware. Or K5prog if that fails.

Edit: There is K5TOOL which seems to be more easy to use. This thread is useful: https://www.eevblog.com/forum/rf-microwave/quansheng-uv-k5(8)-firmware-modding/