Datasheet

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)

Click the DFU icon

Click the Select File button

Select Application from the radio button list, then click OK

Find the appropriate .hex file

(ex. 'blefriend32_s110_xxac_0_6_7_150917_blefriend32.hex')

When asked about the 'Init packet', indicate Yes, and select the appropriate

*_init.dat file (for example:

'blefriend32_s110_xxac_0_6_7_150917_blefriend32_init.dat').

Click the Select Device button at the bottom of the main screen and find

the DfuTarg device, clicking on it