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title: Firmware Updates

parent: User Guide

nav_order: 13

last_updated: 2026-07-07

description: Update your radio firmware over Bluetooth or USB — OTA process, version channels, pre-flight checks, and recovery.

aliases:

• firmware

• update

• ota

• flash

Keep your Meshtastic radio up to date with the latest firmware for new features, bug fixes, and security improvements.

1. Open the connected radio's configuration and, under Advanced, tap Firmware Update. The entry appears only for OTA-capable devices.

2. The app checks for available firmware versions.

3. Available updates show the version number and changelog summary.

The most common update method for Android users:

1. Ensure your radio is connected via Bluetooth.

2. Navigate to the Firmware Update screen.

3. Select the desired firmware version.

4. Tap Update to begin the OTA process.

5. Wait for the update to complete — do not disconnect during the update.

!Firmware checking for updates

│ ⚠️ Warning: Interrupting a firmware update can brick your device. Ensure your radio has

│ sufficient battery (>50% recommended) and maintain Bluetooth proximity during the entire process.

!Firmware disclaimer

When your radio is connected over USB/serial (rather than Bluetooth), the Firmware Update screen offers USB File Transfer. The app reboots the device into DFU mode, then prompts you to save the T383838.uf2 file to the device's DFU drive using the system file picker. This option appears only on a USB/serial connection — it is not available over Bluetooth.

│ ℹ️ nRF bootloader note: A vendor bootloader supplied as a T383838.zip (e.g. RAK WisBlock RAK4631) has to

│ be flashed with a serial DFU tool such as T383838adafruit-nrfutil — copying that T383838.zip to the drive won't

│ work. A bootloader supplied as an T383838update-....uf2 can be installed by copying it to the drive;

│ that is how the app's own bootloader upgrade works. The app surfaces a hint when the serial-only

│ route applies.

On a USB/serial connection, nRF52 and RP2040 devices also offer Erase and reinstall and, where an upgraded bootloader is published for the board, Upgrade bootloader.

Erasing wipes everything on the device — channels, keys and all settings — and there is no backup, so the app asks for confirmation first. Both operations write two files in turn, so you will be asked to select the device's update drive twice: once for the erase or bootloader image, then again for the firmware.

The app reads T383838INFO_UF2.TXT from the drive you select to confirm it really is the device's update drive and to identify the board before writing anything. If it can't confirm which Bluetooth stack your device uses it refuses to erase and points you at the Web Flasher instead — picking wrong there can leave the device needing a hardware programmer to recover.

For recovery or when neither OTA nor in-app USB is available:

• Use the Meshtastic Web Flasher

• Or the Meshtastic CLI tool on desktop

Before updating:

• [ ] Battery > 50%

• [ ] Stable Bluetooth connection

• [ ] Note your current settings (they may reset on major version changes)

• [ ] Check the release notes for breaking changes

After the firmware is written, the app verifies the update and waits for the device to come back online:

!Verifying update and waiting for the device to reconnect

Once the update succeeds:

• The radio will reboot automatically

• Bluetooth connection will re-establish

• Verify your settings are intact

• Confirm the new version under Currently Installed on the Firmware Update screen — it's also shown on the node's detail page and the Connections screen

!Firmware update success

If the update appears frozen:

• Wait at least 5 minutes before intervening

• If truly stuck, power-cycle the radio

• Attempt the update again

!Firmware update error

If your device fails to boot:

1. Try connecting via USB to a computer

2. Use the web flasher in recovery/DFU mode

3. Flash a known-good firmware version

4. Check the Meshtastic Discord for device-specific recovery steps

The app may show warnings when:

• Connected radio firmware is below minimum supported version

• Major version mismatch between app and firmware

• Deprecated features need migration

│ ⚠️ Important: Always update the Meshtastic app before or alongside firmware updates to ensure

│ compatibility.

• Connections — reconnecting after a firmware update

• Flashing firmware guide — full firmware flashing walkthrough on meshtastic.org

• Supported devices — check firmware compatibility by device

• FAQ — common questions on meshtastic.org