Are you using the drive or via an external USB enclosure ? Share public link
Before diving into the specifics of version 1.00, let's establish the hardware. The LG BU40N is a slim, 9.5mm slot-loading or tray-loading Blu-ray writer. It is commonly found in high-end laptops (such as older Alienware or Dell XPS models), external USB enclosures (like the Buffalo BRXL-PU3), and custom home theater PCs (HTPCs).
Open MakeMKV. Look at the "Drive Information" panel. Note the "Firmware version." If it is 1.00, you are done. If it is higher (e.g., 1.03 or 1.14), proceed. bu40n 1.00 firmware
It enables software like MakeMKV to bypass AACS2 encryption using hashed keys.
Because many BU40N drives (and rebadged versions like those from HP or Verbatim) ship with newer, encrypted firmware (e.g., 1.03 or 1.05), users often "downgrade" to 1.00. Preparation : Tools like the SDFtool Flasher are used to automate the process. Encryption Bypass Are you using the drive or via an external USB enclosure
Flashing firmware carries a risk of "bricking" (permanently breaking) your drive. Always ensure you are using the correct tools and have a stable power supply.
Click "Browse" and navigate to the MakeMKV firmware directory. Select the correct, untouched HL-DT-ST-BD-RE_BU40N-1.00 bin file. It is commonly found in high-end laptops (such
: A known quirk of the BU40N (regardless of firmware) is a tendency to stall or spin down during long 100GB rips. On v1.00, the drive usually resumes eventually, whereas newer firmware might throw a hard "scsi error."
The LG BU40N is a highly popular slim, internal Ultra HD Blu-ray drive frequently used in laptops, small form factor PCs, and custom external enclosures. For home media enthusiasts, this specific drive holds legendary status. However, its usefulness for advanced media archiving depends heavily on a single factor: the firmware version. Specifically, the original factory is considered the holy grail for users looking to back up their legally purchased 4K Ultra HD Blu-ray collections.
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