Manta40 rev2 Ortho

Product relationship

Manta40 rev2 Ortho is part of the Manta keyboard family, the ortholinear version of Manta40 rev2, also using the Trichord architecture (see Manta Family Overview)).

Quick identification

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

Do-not-mix warning

• Manta40 rev2 Ortho and Manta40 rev2 (standard layout) firmware cannot be mixed.
• Ortho firmware is only for the ortholinear layout; do not mix with standard layout.
• Manta40 rev2 Ortho (Trichord) and Manta legacy AVR PCB firmware cannot be mixed.

Spec summary

Item	Value
MCU	STM32L412 + CH592
Connectivity	USB / 2.4G / BLE
Bootloader	TinyUF2
Firmware format	.uf2
VIA / Vial	Supported
Layout	40% Ortho
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 Ortho.
2. Enter bootloader (see Wired Flashing).
3. Copy the .uf2 file to the mounted USB drive.
4. Reboot and test typing, layers, and wireless functions.

Manta40 rev2 Ortho 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 on Ortho

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).
• Ortholinear layout with layer-4 preset wireless keys.
• 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)

Difference from standard Manta40 rev2

• Trichord behavior is the same on both boards.
• The difference is layout and physical key positions, so firmware is not interchangeable.

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