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Programming nRF9160 modem firmware with a stand-alone SEGGER J-Link

I have a PCB containing an nRF9160 using a SEGGER J-Link. I am able to update the application firmware at will using a variety of tools but if I use nRF Connect v3.2.0 to run Programmer v1.2.3 and select the J-Link device, the software hangs.

As far as I am aware, nRF Connect / Programmer is the only supported way to update the modem firmware, so how can I get new modem firmware on my PCB?

I have tried using an nRF9160-DK but I was unable to get the board to detect the external target.

I did also try nrf9160_mdm_dfu but that stopped working with the 1.0.0 release, giving a the error:

ERROR: Missing file: firmware.update.image.hex

Kind regards,

Jonathan

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