Image Sensor Firmware

Any chance the firmware on the image sensors can be flashed? I noticed a couple of headers exposed below the batteries.

Nope.

My understanding is the firmware is not upgradeable OTA, and In any event, ADC doesn’t provide any of their firmware for download/flashing.

I noticed a couple of headers exposed below the batteries.

Those are not used for firmware, no. These allow ADC physical access to images should they be required and inaccessible normally for some reason.