Date: 2025-06-07

HHKB Classic unlocked

Fixed layout.
No remapping. Officially.

Tool exists. PFU Professional Keymap Tool
Windows and macOS only.
Used for Hybrid models.
Firmware updates work for Classic.
Key remapping is disabled.

In Windows only.
C:\Program Files\PFU\Happy Hacking Keyboard Keymap
Tool\keyboardDataList.json 

Find your model.
Example: PD-KB401B (Charcoal)

Change:
"isKeymapChangeable": false
to
"isKeymapChangeable": true

Launch the tool.
Keys can be remapped.
Most of them.
Some reserved. Leave them.
Persistent. Onboard.

Example remaps:
Arrow keys on ESDF
Right Alt -> Home
Right Win -> End
All while hands stay on home row.

HHKB Classic, unlocked.
Not supported. Still possible.
One word changed.
False -> True.