So should i continue to post in this thread for troubleshooting UHD decryption or start a new one?
The flashing as you can see from my previous post went ok, I went straight from BU14 to BU10 and the result posted in the screenshot in my previous reply seems to indicate success to me. DVDfab is my preferred app of choice for this stuff and it still doesn't like what it's seeing on the drive with a UHD disc trying to read it. I gave MakeMKV a try also and it seemed to get a little further but ultimately failed too, with the following:
Error 'Scsi error - NOT READY:LOGICAL UNIT IS IN PROCESS OF BECOMING READY' occurred while reading 'BD-RE BUFFALO Optical Drive 1.03 MO6LCQD5718' at offset '33365557248'
Error 'Scsi error - NOT READY:LOGICAL UNIT IS IN PROCESS OF BECOMING READY' occurred while reading '/AACS/DUPLICATE/Content001.cer' at offset '0'
Error 'Scsi error - NOT READY:LOGICAL UNIT IS IN PROCESS OF BECOMING READY' occurred while reading '/AACS/DUPLICATE/Content001.cer' at offset '0'
Error 'Scsi error - NOT READY:LOGICAL UNIT IS IN PROCESS OF BECOMING READY' occurred while reading '/AACS/DUPLICATE/Content001.cer' at offset '0'
Error 'Scsi error - NOT READY:LOGICAL UNIT IS IN PROCESS OF BECOMING READY' occurred while reading '/AACS/DUPLICATE/Content001.cer' at offset '0'
Error 'Scsi error - NOT READY:LOGICAL UNIT IS IN PROCESS OF BECOMING READY' occurred while reading '/AACS/DUPLICATE/Content001.cer' at offset '0'
Error 'Scsi error - NOT READY:LOGICAL UNIT IS IN PROCESS OF BECOMING READY' occurred while reading 'BD-RE BUFFALO Optical Drive 1.03 MO6LCQD5718' at offset '33365557248'
Backup failed
Update 1: Ok so I made sure to connect both usb cables and MakeMKV seems to be doing ok so far decrypting my test disc. Will have final results in about an hour or so. Will try with DVDfab again after this is completed...not knocking the Makemkv app at all, but I purchased a lifetime license for dvdfab a few months ago.
Update 2: MakeMKV worked flawlessly, after which I tried DVDfab again and continue to receive the firmware error below. I know the easy solution is to simply just use Makemkv from here on out but I'm rather glum because I had already purchased a lifetime license for fab which seems useless now. Is it looking for a different firmware version? I haven't changed anything since my previous post successfully flashing to 1.03/BU10 in the above screenshot.

- dvdfab_error.jpg (31.42 KiB) Viewed 6356 times
Update 3: So I used the modified Asus utility from the site links to flash the drive again using DE_Buffalo_BRUHD-PU3_BU10 and even tried DE_LG_BU40N_1.00. Both were successful, Makemkv works with all of them so far, yet DVDfab doesn't like any of these firmware versions and keeps giving me the same error. I even double-checked on their web page here and it claims it will work with these versions.
https://www.dvdfab.cn/manual/uhd-copy/s ... uhd-drives