I’ve been approaching this the wrong way.

The latest build now has a diagnostic bundle specifically for cases the recovery engine does not understand.

Select the working directory, select the image, then:

Advanced > Create diagnostic bundle

Post or email me the resulting bundle.

It does not require sending the disk image. It gives me the structural information needed to compare unsupported Sony XAVC variants and improve the recovery engine.

Hopefully this makes it easier to investigate failures from other cameras and cards as they turn up.