factory reset nrf52-dk

Question

Hello Nordic, 
 I've acquired several nrf52-dks and I use them almost exclusively to flash with nrfConnect on the PC. 
 To learn more about nrf programming I started with Segger Embedded Studio, easy installation so far all right. 
 Now I want to reuse the nrf52-dk with nrfConnect. 
 What do I have to do? 
 I asked this some time ago, but cannot find the thread anymore. 
 I remember this: 
 - download a binary file named "J-Link OB-SAM3U128-V2-NordicSemi 170724.bin" 
 - drag and drop it onto the nrf52-dk 
 - power cycle 
 BUT: This doesn't work. Do I miss a step? Press the IF Boot Button on power-on?

Einar Thorsrud · Accepted Answer

Hi, 
 I think you are confusing programming the onboard JLink LITE debugger and the nRF52. You never need to reprogram the onboard debugger when changing between using the DK for development and with nRF Connect. The only thing you need to do before using the board with nRF Connect is to erase the flash using "nrfjprog -e". Then launch nRF Connect and select the correct board. The nRF52 will be programmed with the correct firmware from nRF Connect automatically (after first prompting the user). 
 Details: The J-Link OB-SAM3U128-V2-NordicSemi 170724.bin file that you refer to is firmware for the onboard debugger, which you normally never need to flash manually (with a few exceptions). As you write, you have to press and hold the reset button while power cycling in order to upgrade the debugger chip (it will show up as a USB mass storage device).

factory reset nrf52-dk

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