baud rate for softdevice programming

[Owlman]

I am trying to reprogram a usb dongle device from AdaFruit (Bluefruit LE Sniffer), which uses the nrF51822 SoC, using nrFGo Studio. In the device manager I'm innRF5x Bootloader and I can select the .hex I want and select softdevice. The com port is present and I've tried ever baud rate in the drop down list but keep getting the following error:

Upgrading target on COM5 with DFU package: Timed out waiting for acknowledgement from device. Failed to upgrade target. Error is: No data received on serial port. Not able to proceed. Possible causes: -bootloader, SoftDevice or application on target does not match the requirements in the DFU package. -baud rate or flow control not the same as in the target bootloader. -target is not in DFU mode. If using the SDK examples, press Button 4 RESET and release both to enter DFU mode.

There is only a switch toggling UART and CMD and a button which I can only guess is a reset switch.

I appear to be shorting something out because when I do attach the SWD plug the blue LED on the usb dongle goes off.

Any suggestion as to how to reprogram this device?

[Hung Bui]

Hi Owlman,

Have you tried to contact Adafruit ? Do you have the schematic of the board ? I suspect that the UART pins they used could be different from the UART pin we configured by default in the bootloader source code. Also check if the 32kHz crystal exist on the board.