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All good now. Received WH16NS60 and flashed to HL-DT-ST-BD-RE_WH16NS60-1.01-NM00100-211711202000. Reads both problem discs with no issue.

Thanks for reply, jonghotti. Unfortunately, I can't backup these 2 discs as my LG WH16NS40 drive can't open them. Like I said, I've successfully backed up almost 20 UHD disks (probably 100+ Bluray) and do understand/follow the unofficial procedures pretty well. First thing I do after purchasing new ...

I have an LG WH16NS40 NS50 that I purchased early December 2018 and immediately crossflashed with Asus BW-16D1HT DE firmware 3.01. For the last few months, it has served me pretty well with UHD disks I purchased and then ran through MakeMKV (currently using 14.3). Of about 20 UHD disks I now own, I ...