How can we flash the original factory (out-of-the-box) FW for the nRF9160?

Question

Somehow my nRF9160 DK board has become essentially unresponsive. Flashing new modem using nRF Connect Programmer, and downloaded nRF FW, "seem" to work. But nothing else. No signal can be seen, no AT command response, no LED 3/4 are ever on. So it's impossible to know what happened. So t his possibly due to lacking instructions in how to setup the device? 
 How can we flash the original factory (out-of-the-box) FW for the nRF9160 DK board? 
 (a) Do we need to flash also the on-board nRF82840? (How to tell the difference what is getting flashed?) 
 (b) Where is the correct FW to flash for my board?

E3V3A · Accepted Answer

Thank you Martin! Following your detailed instructions made it quite easy! The only issue was that you need to force the git checkout to discard old cruft. 
 
 git checkout -f master

As for the rest, I'll fill in the blanks: - Follow the steps (by Martin) above. I'll try to clarify some of that. If you have cleaned out the build directories and have a semi-pristine EmStudio, then when you start it, it should look like this: 
 Enter the info as suggested: 
 
 This will load the project and add all the relevant files. If successful it should look like this:

Now the project is ready to be built. Select: Build > Build Solution (or simply press Shift+F7)

This will compile the project and create the HEX files: $ cd "C:\NordicS
cs
rf\applications\asset_tracker"
$ find ./ -iname "*.hex"
./build_nrf9160_pca10090ns/spm/zephyr/zephyr.hex
./build_nrf9160_pca10090ns/zephyr/merged.hex
./build_nrf9160_pca10090ns/zephyr/zephyr.hex

# Welcome to Cygwin! :)

Opening the project folder, you should see the merged.hex file, that you can use to flash the asset_tracker . You can use the nRF Connect - Programmer to do this, but you can also do it within the EmStudio by connecting the J-Link and "download" the HEX file. (Here "download" means, download from your PC to the nRF9160 DK). Do this: 
 (a) connect the J-Link programmer: 
 
 (b) "Download" the HEX file to your "target":

The output should be:

You can now fire up your nRF Connector - LTE Link Monitor and everything should work. The hardest part is to get the LTE connection with the provided iBasis SIM card...

Martin Lesund · Answer

Hi E3V3A, 
 a) The nRF52840 on the nRF91DK works as a board controller and has its own firmware. ( code ) 
 If you are going to flash something to the nRF52 device you need to switch SW5 to nrf52 so the Debug/programmer is routed correctly. 
 b) Section Placement documentation 
 you should not need to change it

How can we flash the original factory (out-of-the-box) FW for the nRF9160?

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