How to exit nrf51 DK bootloader mode

[John Nguyen]

I try to how if boot/reset while power up the board and the LED5 is blinking but when I unpluged the cable and plug it again. The LED doesn't turn on any more. And the computer doesn't recognize the board. I still can access the Bootloader mode. So. How to really exit this mode and go back to normal. Thanks

[Rohit]

Hello All,

I have also facing same issue as mentioned above.

It is working fine previously but now if i plug in / out usb the main LED is not blinking.

If i pressed reset button several time then in between it is going into bootloader mode by generating new drive as "Bootloader"

And it is not showing J-link connection also.

Please help me out.

Provide your input on this issue.

Thanks

Rohit

[Bjørn Kvaale]

Take a look at this devzone case.

[Rohit]

Thanks for reply.

I have tried your procedure but my board is not coming out of the bootloader mode.

And now it is not showing that bootloader drive also, led also not glowing..

any another way is there then please let me know.

I am stuck last four days to problem.

Regards,

Rohit

[Bjørn Kvaale]

Did you try flashing the J-Link interface MCU FW to your device like mentioned in the link I sent?

[Rohit]

Hello Sir,

Thanks for your reply.

Yes I have followed.

My board is came out of bootloader mode now, Board is working normally,

But new issue is came for the board connectivity in nrfstudio while flashing code on hardware.

(I am using here nrf52 DK board, for flash program-nRFstudio)

Board is not detecting in the nRFstudio. Previously it is working properly but after above issue the board is not displaying .

This issue is not only for nrf52 dk but same for nrf51 board also.

Now  unable to load bootloder/softdevice/app file or other .hex from the nRFstudio as below

So what steps i have to follow to solve this issue?

Please provide your inputs.

Regards,

Rohit

[Bjørn Kvaale]

Please do not use nrf go studio. Try using the programmer app in nRF Connect for Desktop instead.

[Rohit]

But i can't program from the nRF Connect for desktop.

If i wanted to load some other hex file rather than current project ,  not possible for that nrf connect. It is not having option to load hex file to target.

And for Segger IDE only i can load my project hex file not other.

nrf studio we can load all softdevice/bootloader/app hex file.

[Bjørn Kvaale]

Have you taken a look at the documentation yet for the nRF Programmer app?

[Rohit]

Thanks for your reply.

I have gone through documentation like.

My problem is solved. the problem was the .dll file not present.

So i have reinstalled nrfstudio properly with nrfjprog , now it is showing board is connected and i can program now my board.