Bu40n 1.00 Firmware Today

Solution: You forgot to tick the "Encrypted" checkbox. Re-run the flasher with that box checked.

In the world of optical media archiving and 4K Blu-ray ripping, few topics generate as much discussion in forums like MakeMKV, Reddit, and Doom9 as the BU40N 1.00 firmware.

If you own an LG BU40N slim internal Blu-ray drive, you have likely stumbled upon warnings not to update your firmware. You may have seen cryptic references to "SVC code NS50" or "flashing to 1.00." This article is the definitive resource for understanding what this firmware version is, why it is the "Holy Grail" for ripping 4K UHD discs, and exactly how to use it safely. bu40n 1.00 firmware

Step 1: Identify your current firmware. 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.

Step 2: Download the necessary tools. Do not use LG’s official website. You need the community tools found on the MakeMKV forums (specifically the "Ultimate UHD Drives Flashing Guide" thread). Solution: You forgot to tick the "Encrypted" checkbox

Step 3: Put the drive into "Recovery Mode?" (Usually not required for BU40N) Most BU40Ns can be flashed directly. Connect the drive. Ensure no disc is inside.

Step 4: Use SDFtool Flasher.

Step 5: Wait for completion. The process takes approximately 30 seconds. Do not power off your PC or interrupt the USB/SATA connection. The drive may eject or make clicking noises—this is normal.

Step 6: Power cycle. Physically disconnect the drive from power (unplug SATA power or USB cable), wait 10 seconds, and reconnect. Step 5: Wait for completion

Step 7: Verify. Re-open MakeMKV. The firmware should now read 1.00. You should see "LibreDrive Information: Status: Enabled".