Firmware Hot: Bu40n 100

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

Open MakeMKV and check the "Drive Information" tab. It should list the product as HL-DT-ST BD-RE BU40N . bu40n 100 firmware hot

Some users report that 1.00 is the most stable version for burning high-capacity 100GB BD-XL discs, whereas newer versions can occasionally trigger write errors. Managing Thermal "Hot" Issues Look for DE_LG_BU40N_1

The BU40N is an ultra-slim laptop-style drive. Because it lacks a dedicated internal fan and has a small physical footprint, it generates significant heat during the 45–90 minute process of ripping a 4K disc. Some users report that 1

Version 1.00 is a "UHD-friendly" firmware that allows software like MakeMKV to bypass AACS 2.0/2.1 protection on 4K Blu-rays.

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

Never cross-flash a BU40N with firmware from a desktop drive (like the WH16NS60), as this will permanently brick the slim drive. Ultimate UHD Drives Flashing Guide Updated 2021 : r/makemkv