nrf51 422 QFAC : no device is connected ?

[Nour_l]

Hi , I've just started using a Nordic's product : an nRF51 422 QFAC develepement Kit I was running tests by loading examples on this board when I lost the connection between the nRF and the computer , to be honest the example's loading was kind of really excessive because i had some issues with the board responding to the code ... i used different IDEs : Keil and IAR and I copied the .hex file to the external storage device (J-link) ... I proceeded in that way for a coupe of times which had lead , as far as I believe, to the fact that the device could no longer be detected neither by nrfgo studio or any IDE nor as a storage device . Now Led 5 is permanently off (the 4 other leds are still working anyway) Thank you for your attention . P.S this post had been edited just to make clearer for further reads

[Nour_l]

Hi first of all I have to admit being "stupid" as far as dealing with the board lately : I have loaded some examples and since I had issues with its response ,something like : the IDE saying everything is fine and the board acting otherwise , so I tried different IDEs and I've tried copying the .hex file multiple times (it only responded correctly to the manual file copying ) I kept doing that and I lost connectiion in the process but to mention the last program is stilll running (softled blink) I have tried to jump the 2-pin P22 (it was suggested at "similar" case ) but still no response ... I plugged different USB cables , different ports ... yet nothing have changed

[wlgrd]

Okay, then the nrf still has power. Have you tried flashing the board with Keil, nrfgo studio or nrfjprog? Does the board enumerate as an external storage device on your computer still? I don't have my hardware before Tuesday, but I would advise you to contact Nordic support directly, since per my knowledge at least, the Segger OBD (which has the label) should never be affected by this procedure. What version of the DK do you have?

[wlgrd]

Also, try holding the reset button while powering up and see if it goes into bootloader mode. If not, you need an external jlink debugger with a 10 pin adapter to recover the OBD

[Nour_l]

Seriously ... you kind of saved my life ... I'll be eternaly in debt to you the solution was "holding the reset button while powering up "

[Nour_l]

to be honest I do not know how to proceede after that ... it shows an externastorage device named BOOTLOADER and the led 5 keeps blinking (i take it as a very good news comparing to the previous state ) is there something I can do ?

[wlgrd]

Yes, it is described in the user guide what file to transfer to it. The file is downloadable from nordicsemi. I just can't remember everything out of my head at the moment :/