Olympus / OM System firmware research

Shared knowledge and tools for studying and modifying Olympus and OM System camera firmware.

Custom firmware
Stable
Medium brick risk

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Pre-release · 18 Oct 2026PEN-F HSL alpha — 17 October 2026

PEN-F HSL alpha for Olympus PEN-F firmware 3.1.

New since the 13 October alpha:

Hue, Saturation and Lightness now cover −7…+7.
H/L are preserved by ordinary OM Workspace settings backup/restore.

The ZIP contains the patched BIN, stock-restore BIN, instructions, checksums and patch details. Both firmware BINs include main and OSD components (44,433,408 bytes each), so the Value bitmap is included and no previous HSL installation is required.

Release README · Installation and downgrade instructions

Install BIN SHA256:

4f9a36e6742728ded3d9b443915355f1d1eea0371e1da673f322de970994f717

Stock-restore BIN SHA256:

e13f9813d01d15441082ed907966aec54356d70ba0f75ae9b6c2b259ff01f26a

Before downgrading, bring every saved COLOR saturation value within −5…+5, including custom modes. The firmware menu continues to display 3.1.

Stock restoration followed by installation of this exact combined release BIN passed on the project camera on 17 October 2026. Offline updater and checksum checks also pass. Experimental firmware is used at your own risk; recovery from every failure is not guaranteed.

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