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Problem still present in 1.17.9 Saved AACS dump file as ... The volume key is unknown for this disc - video can't be decrypted I could further narrow it down: It works with normal Blu-rays (tested with AACS v28), but not with UHD Blu-rays (tested with AACS2.0/C v77). The issue is probably related to...

Thanks for your suggestions! As indicated in the original post, the same drive, with the same firmware, same disc, same PC and same USB-Port works just fine when using Windows.

I can't really find any other reason than there is something missing or broken with the Linux version.

I'm receiving a lot of 'KEY NOT PRESENT' and some 'KEY NOT ESTABLISHED' errors using the linux version: MakeMKV v1.17.8 linux(x64-release) started Backing up disc into folder ... Error 'Scsi error - ILLEGAL REQUEST:COPY PROTECTION KEY EXCHANGE FAILURE - KEY NOT PRESENT' occurred while issuing SCSI c...

I was just curious, how you would modify firmware or create a new one for an existing drive.

There is a product page for the MT1959: https://www.mediatek.com/products/optical-disc-drive/mt1959 But aside from that, there seems to be absolutely nothing on the internet about this chip. It's probably not a big surprise they don't want the datasheet to be freely downloadable for everyone, but gi...