Look for DE_LG_BU40N_1.00.bin within the "All You Need Firmware Pack" widely shared on the MakeMKV Forums .

Unlike newer "MK" (MakeMKV-specific) patched firmwares like 1.03-MK or 1.04-MK, the 1.00 "DE" (Downgrade Enabled) version is widely compatible with a broader range of software, including DVDFab and Xreveal .

High temperatures can expand internal components slightly, leading to "ScSI Error" or "Read Offset" failures mid-rip.

Most users use the SDFTool Flasher (a GUI for MakeMKV's command-line tools) to flash the drive.

The search for typically refers to two distinct issues: the high demand for Firmware v1.00 due to its ability to bypass 4K UHD copy protection, and the physical heat issues that slim drives like the BU40N face during intensive ripping tasks . Why Firmware 1.00 is "Hot" (High Demand)