Nrf52840 Custom Board Not Detected After erase from VSCode

[Dhaval Dalvadi]

We are facing strange issue we have this board https://www.raytac.com/product/ins.php?index_id=47

whenever we flash any firmware it works fine but if we erase from vs code it no more detectable to flash or do anything again ?

using nrf connect sdk 2.7.0 already have brick 5 boards so worried to try on more

[Vidar Berg]

Hello,

Have you created a custom board with the Raytac module in the link, or are you using a Raytac development board? In either case, it would be helpful to see a picture of your setup (board + debugger) along with your board schematics. I can't think of any obvious reasons why the board would become bricked after an erase.

Best regards,

Vidar

[Dhaval Dalvadi]

Here is schematic for reference 

connection using Segger and have connected 3.3v and GND from TTL and SWDIO and SWDCLK from segger 
it flashes other boards but not if already flashed and trying to reflash this custom board 

Here is the error message from nRF connect sdk Desktop Programmer when try to connect and flash

14:44:42.102 Failed "reading readback protection status for application core". Error: code: 1, description: Generic, message: Batch task protection-get failed, [Probe] Device error: Failed to write DebugPort register 2: Unknown Error in J-Link DLL (error code =-1)
14:44:42.313 Error: Failed with exit code 1. One or more batch tasks failed: - [Probe] Device error: Failed to write DebugPort register 2: Unknown Error in J-Link DLL (error code =-1), code: Generic. Message: Batch task protection-get failed, [Probe] Device error: Failed to write DebugPort register 2: Unknown Error in J-Link DLL (error code =-1).
14:44:42.313 Error: Failed with exit code 1. One or more batch tasks failed: - [Probe] Device error: Failed to write DebugPort register 2: Unknown Error in J-Link DLL (error code =-1), code: Generic. Message: Batch task protection-get failed, [Probe] Device error: Failed to write DebugPort register 2: Unknown Error in J-Link DLL (error code =-1).

[Vidar Berg]

Please see if you are able to recover the board using nrfutil from the commnand line:

nrfutil device recover

[Dhaval Dalvadi]

Hi Vidar Berg had tried nrfjprog --recover but no luck
I see it only happens if have erased board 

[Vidar Berg]

OK, I can't think of any obvious reasons for this. Please provide as much relevant details as possible. Were you using a board from Raytac?

[Dhaval Dalvadi]

Vidar Berg module is from Raybac but have made our own board as shared schematic