nrf52480 dongle bricked after recover in OpenOCD

Question

Dear all, 
 
 I am facing similar issue. found in this thread: 
 devzone.nordicsemi.com/.../364579 
 I used openOCD running on Raspberry Pi to debug nrf52480 dongle with Eclipse and but I experience some problems not being able to run my code on the dongle when pressing build in Eclipse. Nevertheless after removing the dongle from my Raspberry and plugging in again, the LED on dongle started to flash RED which looked ok again, but the openOCD offered me to enter command nrf52_recover. After this command the dongle stopped working. I probably erased the firmware which must be recovered. I am experiencing voltage 2.9V on C27,does that mean it could still be recovered? In this post the guy had 0V cross C27.If so, is it necessary to use J-link or any other probe to upload the firmware or is there any other way when having 2.9V across C27? 
 
 Thank you

Ivo H · Accepted Answer

Hello, 
 I managed to do it! 
 This managed to unlock the device (make sure you have set up OpenOCD on Raspberry properly to be able to communicate via SWD): 
 sudo openocd -f rpi_as_debugger.cfg -c "transport select swd" -f target/nrf52.cfg -c "init;nrf52_recover" 
 or this: 
 sudo openocd -f rpi_as_debugger.cfg -c "transport select swd" -f target/nrf52.cfg -c "init; nrf52.dap apreg 1 0x0c; nrf52.dap apreg 1 0x04 0x01; reset; nrf5 mass_erase; reset; shutdown;" 
 Now I do not know which one is the right one, probably the first one. I guess both do quite simmilar job, but one of them was not working properly. 
 But still I could not see the red LED flashing. 
 Entering this command fixed it all: 
 sudo openocd -c 'bindto 0.0.0.0' -f rpi_as_debugger.cfg -c 'transport select swd' -c 'adapter speed 100' -f target/nrf52.cfg -c 'init' -c 'halt' -c 'nrf5 mass_erase' -c 'program a.hex verify' -c 'reset' 
 a.hex is this file (the official Nordic firmware for pca10059): /cfs-file/__key/communityserver-discussions-components-files/4/1373.pca10059_5F00_bootloader.zip 
 
 Then unplugged the dongle, plugged in and restarted OpenOCD and works like a charm back again! 
 Please could anyone verify this way as a correct way? 
 Thank you

nrf52480 dongle bricked after recover in OpenOCD

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