Open bootloader always boots into bootloader mode

[rgujju]

Hi guys,

I flashed the mbr hex file and then the open bootloader to a custom nrf52840 board. When i first connect it, it boots into the bootloader mode and i am able to upgrade the firmware using nrfutil. And the new firmware is running. But when i unplug and replug the board it again boots into the bootloader mode. How do i solve this issue?

The new firmware zip package is generated by first merging blinky.hex and mbr.hex and then the combined merged filed is used to generate the zip package using nrfutil using the following command:

nrfutil pkg generate --debug-mode --hw-version 52 --sd-req 0x00 --application blinky_merged.hex blinky.zip 

[Vidar Berg]

Hi,

Please try to set the NRF_BL_DFU_ENTER_METHOD_PINRESET  define to '0' in sdk_config.h for the bootloader and see if you get the same result. By the way, it is not necessary to merge the mbr with the app image, nrfutil will omit the MBR when converting the hex to binary. 

[rgujju]

Yes! that fixed it. Thank you.