The specific identifier 2.70.8 is not just a random number. Through reverse engineering and field reports, this firmware revision introduces:
Compatibility Warning: Do not attempt to downgrade firmware from 2.70.8 to 2.69 or earlier. The hardware revision "A" expects the new bootloader included in 2.70.8. Downgrading may brick the device. pd1732f-ex-a-2.70.8
The exact code pd1732f-ex-a-2.70.8 is a custom factory configuration. For replacement: The specific identifier 2
Monitoring valve position feedback (limit switches) in Zone 1 classified areas. The firmware version 2.70.8 includes specific damping filters to prevent spurious signals caused by vibration on compressor skids. Compatibility Warning : Do not attempt to downgrade