from viewtopic.php?f=16&t=22896 this postUPDATE - 21/12/2021:
The latest version of the SDFtool Flasher has a checkbox option to flash the boot loader with the main firmware to the drive. This is useful for the newer BP50NB40 with SVC: NB52. It's also possible that other newer models may require this option later on. We will all work it out together as we go!!
For the moment, to flash the BP50NB40 SVC:NB52, using the latest SDFtool Flasher, follw the steps below:
1. Flash the drive to BP50NB40 (NB50) 1.03-MK.
Now for the crossflash:
2. Select the RECOVERY option and in the pop up, select the BP50NB40 (NB50) 1.03-MK firmware that you just flashed.
3. Select the BP60NB10 1.00-MK or BU40N 1.00 firmware in the normal drop box.
4. Click START
I did not use the flash the bootloader checkbox at any step however...
I selected BP60NB10 1.00-MK and I can read and rip regular blu-ray but cant do anything or even detect UHD blu-rays. is that because i need to use BU40N 1.00? If so what steps do I take to flash that without bricking my drive?