I have the same problem now that my Mac is running Big Sur 11.6. Tried all of the above with no luck.
The Sony HAP1ES uses a special formatting for the SSD so just plugging in a disk with another format will not work. A good work around though would be to find a way to copy files direct to s Sony formatted disk.
The Sony HAP1ES uses a special formatting for the SSD so just plugging in a disk with another format will not work. A good work around though would be to find a way to copy files direct to s Sony formatted disk.