Manta40 rev2

Product relationship

Manta40 rev2 is part of the Manta keyboard family, the first-class Trichord PCB of the family. The same family also includes legacy AVR PCBs (see Manta Family Overview)).

Quick identification

• PCB silkscreen: Manta40 rev2.
• MCU: STM32L412 + CH592 (Trichord).
• Connectivity: USB / 2.4G / BLE (triple mode).
• Layout: 40%.
• Flashing: .uf2 + TinyUF2.
• Default Bluetooth name: MANTA40.

Do-not-mix warning

• Manta40 rev2 and Manta40 rev2 Ortho firmware cannot be mixed.
• Manta40 rev2 (Trichord) and Manta legacy AVR PCBs (Bluefruit/DuoChord) firmware cannot be mixed.
• Do not flash F60w or other Trichord model firmware onto Manta40 rev2.

Spec summary

Item	Value
MCU	STM32L412 + CH592
Connectivity	USB / 2.4G / BLE
Bootloader	TinyUF2
Firmware format	.uf2
VIA / Vial	Supported
Layout	40%
Wireless backend	CH592 (Trichord)

Recommended firmware download

Firmware, VIA JSON definitions, and SHA-256 checksums are available in the Download Center (see Firmware Downloads).

First use / migration prerequisites

1. Download the .uf2 firmware matching Manta40 rev2.
2. Enter bootloader (see Wired Flashing).
3. Copy the .uf2 file to the mounted USB drive.
4. After reboot, test typing, layers, wireless switching, and pairing.

Manta40 rev2 uses the Trichord wireless architecture and is not part of the legacy BLE firmware → DuoChord migration.

Common features

• Wireless operations: see STM32 CH592 / Trichord.
• Flashing: see Wired Flashing (DFU / TinyUF2).
• PCB identification: see Identify Your Keyboard & PCB.

Default keymap and wireless function keys

Trichord wireless keys

Key	Action
2.4G / CH0	Switch to the 2.4G receiver channel
BLE1 / CH1	Switch to Bluetooth channel 1
BLE2 / CH2	Switch to Bluetooth channel 2
BLE3 / CH3	Switch to Bluetooth channel 3
BLE4 / CH4	Switch to Bluetooth channel 4
BLE5 / CH5	Switch to Bluetooth channel 5
PAR	Put the current channel into pairing mode
CLR	Clear all pairing records on the keyboard (double-press within 1 second)
TOG	Toggle between USB and the most recent wireless channel

Ready-to-use default keys

In factory defaults, Trichord keys are on layer 4 (hold bottom-right RAlt):

• Tab / A / S / D → CH0 / CH1 / CH2 / CH3
• Z / X / C → CLR / PAR / TOG

Model-specific features

• Trichord triple mode (USB / 2.4G / BLE).
• Layer-4 preset wireless keys, ready out of the box.
• Command mode (advanced):

  Command mode shortcuts (advanced)

  Hold both Shift keys first, then press a command key:

  Command key	Action
  Tab	Switch to 2.4G
  Q / W / E / R / T	Switch to BLE1 / BLE2 / BLE3 / BLE4 / BLE5
  U	Switch to USB
  C	Quick toggle between USB and wireless
  X	Put the current channel into pairing mode
  Z	Clear pairing data (double-press to confirm)
  V	Check battery level (percentage output)

First pairing checklist

1. Press a channel key (2.4G or BLE1–BLE5).
2. If discovery fails, press PAR.
3. If connections are mixed up, run CLR (double-press confirm) and pair again.

Troubleshooting

• Cannot connect wirelessly: see Troubleshooting / Wireless.
• No response after sleep: see Trichord device differences.
• Flashing failures: see Troubleshooting / USB & bootloader.

Version compatibility

• Hardware revision: rev2 (only).
• Config tools: VIA / Vial.
• Firmware: QMK / Vial builds for the Manta40 rev2 target.