nRF52 DK boot problem after press IF BOOT/RESET button

[louiey]

Dear all.

I just got nRF52 DK and testing blinky based on KEIL and it works well. I tried one test, IF BOOT/Reset, and nRF52 PDK is not working after below sequence.

• Power off nRF52 PDK
• press IF BOOT/RESET Button and power on
• PC pop ups disk and could see bootloader relates files
• I tried to connect KEIL with JLINK but failed, PC couldn't recognized nRF52 PDK EVM
• power off nRF PDK and power on without press IF BOOT/RESET button
• there is no any LED blinking and if I try to connect JLINK with KEIL, couldn't connected due to couldn't recognized PDK
• so I pressed IF BOOT/RESET button and power on again and could see pop ups and some files inside disk so PDK is not damaged and it works
• I tried again without press button and there is no response, PC couldn't recognize PDK EVM and also KEIL couldn't recognize

nRF52 PDK EVM is working, PC pop ups when power on with button press, but looks not working with normal mode(without press reset button).

I have tried to find information but couldn't find something helpful so could someone help on this problem?

Many thanks. Louiey. : )

[jowegele]

Hi there, I have experienced the same problem after pressing the RESET button. And I followed Remi's description. Now I'm back again, the nrf52 DK is recognized as a J-link device in Seggers J-Flash tool. But in nrf-Connect it will not work. Trying to use the nrf52 DK results in

Error occurred opening serial port.(NRF_ERROR_TIMEOUT)

I tried with nrf-Connect 1.1.0 and 2.2.1 having installed the latest command line tools. What do I do wrong? I use it to make firmware over the air. It worked for so long. I flashed some 50 PCBs last week and now this.

[Aman_Uniolabs]

Which software to use for dropping the "J-Link Interface MCU Firmware" ? Can you explain the process. I got the bin file for Interface MCU but i don't know how to flash it in Interface MCU

[Edvin]

Drag'n'Drop in Windows Explorer. Alternatively, copy it and paste it into the BOOTLOADER device.

[Smriti]

Hi, I entered boot loader mode, and I can come out of that, after following steps : 1) plug in the board with pressing if boot/reset button. And then downloading the file (suggested by you) in boot loader folder. I can connect nrf as it shows JLINK as gdrive on my computer. Then I tried to upload the ble and simple blinky code to my board, keil shows that the code is been uploaded but the board shows no rsponce. Please help.