Command65

Product relationship

Command65 is a keyboard product supporting two wireless backends: legacy BLE firmware (Bluefruit) and AVR DuoChord (same PCB, pick one).

Quick identification

• Product name: Command65.
• MCU: ATmega32U4.
• Layout: 65%.
• Wireless backend: Bluefruit or DuoChord.
• Flashing: .hex + qmk-dfu.

Do-not-mix warning

• Command65 Bluefruit and DuoChord firmware are not interchangeable.
• Command65 and Command65 PE are different PCB/wireless solutions; do not mix. Command65 PE uses ATmega32U4 + CH592 (AVR+CH592) with 2.4G; Command65 only has Bluefruit / DuoChord (BLE).
• Migrating from Bluefruit to DuoChord requires a fixed sequence, see first migration.

Spec summary

Item	Value
MCU	ATmega32U4
Connectivity	USB + BLE (Bluefruit or DuoChord)
Bootloader	qmk-dfu
Firmware format	.hex
VIA / Vial	Supported
Layout	65%
Wireless backend	Bluefruit / DuoChord

Recommended firmware download

Firmware, VIA JSON definitions, and SHA-256 checksums are available in the Download Center (see Firmware Downloads). DuoChord targets also need a matching nRF OTA package, shipped as part of the first-migration kit.

First use / migration prerequisites

• Legacy BLE firmware (Bluefruit): download the matching legacy BLE firmware for Command65, flash it, then pair following Legacy BLE firmware.
• DuoChord: if the module currently runs Bluefruit, flash the AVR DuoChord firmware first, then hold both Shift keys and press F twice to enter DfuTarg, perform OTA, and re-pair. See Legacy BLE firmware → DuoChord first migration.
• Flashing methods: see Wired Flashing (DFU / TinyUF2).

Common features

• Legacy BLE firmware operations: see Legacy BLE firmware.
• DuoChord operations: see AVR DuoChord.
• PCB identification: see Identify Your Keyboard & PCB.

Default keymap

The default keymap provides a 65% layout. Wireless function keys (BLE1–BLE5, PAIR, CLR, etc.) follow the firmware you flash.

Model-specific features

• 65% layout.
• Bluefruit / DuoChord dual wireless backends.

Troubleshooting

• Cannot connect wirelessly: see Troubleshooting / Wireless.
• Stuck keys (legacy BLE firmware): see the Legacy BLE firmware limits.
• Stuck mid-migration: see the first migration.

Version compatibility

• Hardware revision: Command65 (only).
• Config tools: VIA / Vial.
• Firmware: QMK / Vial builds for the Command65 target; DuoChord targets also need the matching nRF OTA package.