PCA10059 not going into DFU mode (no LED flashing)

[roaspey]

I am trying to program a PCA10059 USB dongle which requires it to go into DFU mode.

I have tried pressing the white button when it is plugged in, and I have tried holding the white

button while plugging the dongle in.

Neither causes the red LED to start blinking.

The device is programmed with stock firmware.

Can anyone comment on the likely solution ?

Regards

Rob

[Hung Bui]

Hi Rob, 
We have 2 buttons on the dongle, one is white (the bigger one) and one is gray (the smaller one). You should press the RESET (gray) button to put the dongle into DFU mode (growing red LED)