RE: Couldn't Flash firmware form VS code to new NRF52840DK

Raoul — Thu, 03 Aug 2023 17:12:23 GMT

Hi Gan,

Please see this case: Problem with nrfjprog

Could you try running nrfjprog --recover? Hopefully that solves it.

If not, are you using the on-board debugger, or an external one? For customers using external debuggers, this issue is often caused by SWD lines or power being connected wrongly.

Customers report this from time to time, they usually find out that they made some mistake:

JlinkARM.dll returns '-1' repeatedly, using nRF52840 on a custom development board

Issues Flashing nrf52840

No longer able to program custom nRF52840 over SWD. No idcode detected

JLinkARM.dll reported "-1", an unknown error

Cannot recover nrf9160, JLinkARM.dll reported -1

In some cases the interface MCU (Onboard debugger) is just faulty. Let us know if you think that's the case.

Best regards,

Raoul