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I have made some great new progress on modding and developing custom firmware for HL (Hitachi-LG) optical writers. The tool I built now supports both the MT1939 and MT1959 platforms. It can modify the main binary area;specifically allowing full customization of the firmware version block. This means I can compile a completely bespoke firmware build, renaming the drive identifier, model name, and version number to whatever I like
;From my comparative analysis, the firmware structures of the MT1939 and MT1959 are virtually identical; the primary difference lies in the checksum validation ranges across sections. Because the MT1959 spawned countless OEM variants, its integrity check boundaries are actually narrower and more lenient. In contrast, the MT1939 enforces noticeably stricter checksum coverage.
At this point, a single drive can flawlessly burn virtually every recordable disc registered on the Blu-ray Disc Association (BDA) database. It also provides seamless compatibility with third-party OEM media manufactured by Sony or Mitsubishi/Verbatim. Even proprietary discs restricted to dedicated enterprise or archival machines (such as Amethyst or Primera units) burn with outstanding quality.
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