and thanks Bertrand for the great job you've done with companion 9x.
Actually when i want to upgrade my firmware (i do that frequently due to the release frequency, ex. frsky-656 to frsky-666) i do the following steps:
- Backup my current EEPROM
- Upgrade my firmware
- Restore my backuped EEPROM (because AVRDude has erased it)
If fuses is not the safest solution, why not imagining an "upgrade firmware" button who will automatically do these 3 steps ?