Datasheet

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My Bluefruit LE device is stuck in DFU mode ... what can I do?

If your device is stuck in DFU mode for some reason and the firmware was corrupted, you have several options.

First, try a factory reset by holding down the DFU button for about 10 seconds until the CONN LED starts flashing,

then release the DFU button to perform a factory reset.

If this doesn't work, you may need to reflash your firmware starting from DFU mode, which can be done in one of the

following ways:

Bluefruit LE Connect (Android)

Place the module in DFU mode (constant LED blinky)

Open Bluefruit LE Connect

Connect to the 'DfuTarg' device

Once connected, you will see a screen with some basic device information. Click the '...' in the top-right corner

and select Firmware Updates

Click the Use Custom Firmware button

Select the appropriate .hex and .init files (copied from the Bluefruit LE Firmware repo) ... for the BLEFRIEND32

firmware version 0.6.7, this would be:

Hex File: blefriend32_s110_xxac_0_6_7_150917_blefriend32.hex

Init File: blefriend32_s110_xxac_0_6_7_150917_blefriend32_init.dat

Click Start Update

Unfortunately, the iOS app doesn't yet support custom firmware updates from DFU mode yet, but we will get this into

the next release.

Nordic nRF Toolbox

You can also use Nordic's nRF Toolbox application to update the firmware using the OTA bootloader.

On Android:

Open nRF Toolbox (using the latest version)