The firmware revision is based on the inverter model. It can be read at parameter F105.
You can not flash the firmware on your AC10 to a modern revision. The major and minor revisions of firmware are hardware dependent.
- AC10 Frames 1-5 firmware: 2.x
- AC10 Frames 6-12 firmware: 3.x
- AC10 IP66 All Frames firmware: 4.x