Nrf51Dk not detecting

[Dhaval Dalvadi]

I have used nrf51Dk with nrfPPK before some days
now trying to flash nrf51DK but its not detecting any board
I tried to recover but not recovering it
I have already added jumper on p22 too.

LED5 is on and not blinking

[Susheel Nuguru]

Hi Dhaval,

After removing the PPK from nRF51DK, if the kit is still not responding to nrfjprog on the command line in any way, then there is a large probability that your kit is being shorted or you could have programmed it with something that makes it go to deep sleep too early (without a wakeup source) , hence bricked

[Dhaval Dalvadi]

How can I fix it?

[Dhaval Dalvadi]

When I execute this
nrfjprog --recover -f nRF51

LEd 5 starts blinking but recovering not getting complete

only getting this output
Recovering device. This operation might take 30s.

[Susheel Nuguru]

When your device is dead or bricked, then the nrfjprog would NOT be able to make any communication to your device using the debug port. When this happens, nrfjprog throws a different error. 

I would recommend you to uninstall your segger jlink drivers and re-install the latest ones since it seems the problem is inside the CDC communication of segger driver to your device. It DOES NOT SEEM that your device is dead/bricked yet.

[Dhaval Dalvadi]

Tried installing new jlink drivers
tried installing boot loader in nrf51DK
Reinstalled nrfgostudio

Still same issue
ERROR: Cannot connect to any nRF device. Please make sure a device is
ERROR: connected to the debugger and supplied.

[Susheel Nuguru]

then the device seems to be dead. It could happen if it was supplied with high voltage or if few of the pins are shorted with hand or any other conductor unintentionally.