Flashing Nordic Thingy 91

[Alejandro Chavez]

Hi everyone!

I got a Nordic Thingy 91 and I have tested the sample Asset Tracker application. But now, I want to build and program my own application, I was reading this guide but in the sixth step of Building and programming on the command line, part b, it says:

"Connect the Thingy:91 to the debug out port on a 10-pin external debug probe, for example, nRF9160 DK (Development Kit), using a 10-pin JTAG cable."

Does it mean that in order to flash my Nordic Thingy 91 I have to use one nRF9160 DK?

Thanks in advance,

Alejandro Ch.

[Ivan Herrera]

You can use any general purpose J-Link debugger. If this is for educational use, you can use the j-link edu mini. If you happen to have an nRF52 devkit or nRF9160 devkit laying around, those also work as they both have debug-out ports.

[Alejandro Chavez]

But working only with the Nordic Thingy 91, is not possible?

[Nguyen Hoan Hoang]

You can boot it into bootloader and you nRFConnect Desktop to flash. To enter bootloader, power off, hold SW3 button, power on, release button.

[Alejandro Chavez]

Thanks Nguyen!

So, if I turn on the bootloader holding the SW3 button and I open the nRFConnect Desktop, Programmer, can I flash my Thingy91. It's not?  

[Nguyen Hoan Hoang]

Yes, that is one way to flash it.  For that you need to used the signed hex.  The project generates a few hex files.  Only 2 are to use to flash.  merged hex needs the jtag to flash and signed hex is for flashing using bootloader with nRFConnect.