GMK87 Control

Overview

A native Windows app for the Zuoya GMK87 keyboard: lighting, keymap remapping and screen image uploads, talking to the board directly over USB HID.

The vendor protocol is undocumented, so it was pieced together from captures of a real keyboard. It handles both firmware generations and never writes anything without an explicit click.

Highlights

• Lighting: effect, brightness, speed, colour or rainbow, logo bar, with an animated preview
• Keymap: all 4 layers on the real layout, single-key remap, JSON backup and restore
• Screen: images and GIFs into the two 240x135 slots
• Detects V0104 and V0112 firmware and their different keycode numbering
• Repairs a settings byte that other tools corrupt, which breaks VIA encoder support
• Portable x64 and ARM64 builds, no install or .NET runtime needed