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Success! Thanks for clarifying those commands, Marty!

For anyone else looking to unlock a WP50NB40 slim drive, these were the final commands that ended up working for me:

./makemkvcon f -d '/IOBDServices/0378CC82' -f ~/Desktop/flash/sdf.bin rawflash enc -i ~/Desktop/flash/BP50NB40-NB50/HL-DT-ST-BD ...

Progress! It looks like the first flash finally worked! The drive info is now as follows:

Drive Information
OS device name: /dev/rdisk8
Current profile: BD-ROM
Manufacturer: HL-DT-ST
Product: BD-RE BP50NB40
Revision: 1.03
Serial number: SIM2221U15627
Firmware date: 2120-05-07 09:17
Bus encryption ...

Changed main to enc for the first flash, but still showing "Status: Possible, not yet enabled". Performed full system reboot and no change. Still won't read 4k discs :(

Current commands:

./makemkvcon f -d '/IOBDServices/0378CC82' -f ~/Desktop/flash/sdf.bin rawflash full enc -i ~/Desktop/flash ...

I'm using MacOS with MakeMKV version 1.17.7.

These are the commands that I ran to flash:

./makemkvcon f -d '/IOBDServices/0378CC82' -f ~/Desktop/flash/sdf.bin rawflash full main -i ~/Desktop/flash/BP50NB40-NB50/HL-DT-ST-BD-RE_BP50NB40-NB50-1.03-NM00800-212005070917.bin

./makemkvcon f -d ...

Been trying to unlock libredrive on my WP50NB40 based on the CLI procedures outlined in the ultimate guide.
https://forum.makemkv.com/forum/viewtopic.php?f=16&t=19634

I first flashed BP50NB40-NB50-1.03MK, then BP60NB10 1.02MK. Both steps reported success, but the drive is still showing as `Status ...