That particular firmware is a pain in the ass as it disables downgrade in multiple ways. There are some steps you must take if you want to get the drive working for UHD in more than just LibreDrive mode for MakeMKV.
First, you will need to flash the MK 1.03 version for that drive. That will re-enable the stuff that LibreDrive needs to work and also re-enable firmware downgrades. I'm not sure if the MK 1.03 version has been tried with AnyDVD...it might work so I would try it after flashing the MK 1.03. If it does not, then you will need to flash the DE 1.02 firmware. But that can only be flashed after the MK 1.03 firmware is flashed first.
Things to note. Dosflash is completely irrelevant here as 1.03 has disabled dosflash access to that drive. Downgrading does not re-enable it, either. Fun! But yes, depending on the USB enclosure, you should be able to flash it using a patched flasher. If it does not work, it means your particular enclosure is not compatible with flashing.
Hope this helps!