nRF52840 Meshtastic DFU with MTools BLE

Supported nRF52840 Devices

MTools BLE supports firmware upgrades for the following nRF52840-based Meshtastic devices:

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The interface will display:

When finished:

Setting	Default	Recommended	Notes
Number of Packets	5	1-8	Higher values may cause OTA failure
Download Single Firmware	OFF	–	Downloads only selected device’s package (~600KB) instead of all (~18MB)

When Download Single Firmware is OFF, it will download the full ota zip file of nRF52840 devices from Github. The file will be saved in App Folder, and you can select and preview and extract select ota file for specific device.
When Download Single Firmware is ON, it will just downlaod the ota zip file of the device that you choose.

MTools BLE allows using pre-downloaded firmware files:

	nRF DFU App	MTools BLE
Firmware Acquisition	Manual GitHub download	Auto-download in-app
File Preparation	Manual extraction required	Automatic device matching
Device Connection	Separate file selection step	Direct BLE in-app
Internet Requirement	Always requires pre-downloaded file	Optional (offline mode supported)
User Steps	5+ (Download, extract, transfer to phone, select, connect)	3 (Select, Connect, Start)

Never set Number of Packets >8 – May cause device failure requiring USB recovery
For first-time users, keep default settings (5 packets)
Ensure your device has at least 50% battery before starting
Do not close the app during upgrade process

If upgrade fails:

Try reducing Number of Packets (recommend 3-5)
Ensure stable BLE connection (keep phone close to the device)
For bricked devices:
- Connect via USB to computer
- Use UF2 method to recover, Follow steps on Meshtastic Drag and Drop

DFU Features of Meshtastic on MTools BLE is total free.
Download it on App Store and Play Store.

Install MTools BLE and enjoy RFID

App Store

Play Store