Now, if I unpacked egzumer_v0.22.bin to egzumer_v0.22.raw (saved exactly like that), can I safely try to upload the software to the device?
egzumer firmware uses * for version, so there is no need to unpack it, you can flash it as is with command -wrflash.
Unpack is needed for original firmware, because it has version which will not be accepted by bootloader.
You can specify version manually for unpacked firmware image to bypass bootloader version check.
But since original firmware depends on NVR content, you cannot run original firmware v2 on v5.
So, this operation useless with no NVR change.
If I have copies of my_calibration.bin and my_config.bin, will I be able to revert to the original version in the same way?
just run when the radio is powered on:
./k5tool -rdee
it will save full eeprom backup to
eeprom-0000-2000.raw, save this file if you want to revert all configuration and calibrations back.