Default boot-loader for dongle

[Hiihtaja]

Hello !

1. I have found in internet bootloader for dongle graviton_bootloader_mbr_v1.0.1-\[nRF5_SDK_15.0.1-1.alpha_f76d012\].hex and able to flash and use it.

   But where I can found latest version of precompiled bootloaer what is based on latest SDK ?

  Or it should be compiled by myself from some known sources  ? Please point me to right page/code.

2. By using the bootloader and nrfutil, I'm able to create dfu.zip and update application only.

BUT

how  issue SW reset by using nrfutil without actual update ?

Sometimes I put dongle like HW to DFU by Reset mode and need to reboot it to normal boot without power on/off operation ?

How to erase application without actual update of it ? Just bootloader should remain.

Regards,

Eugene

[Simonr]

Hi Eugene

I would recommend the Open bootloader that has more relaxed security compared to the secure one, and makes it easier to add the public key that's required to update the bootloader itself over USB. But it should be perfectly fine using the older .hex file as well unless you want to implement some custom features to your bootloader.

Best regards,

Simon

[Hiihtaja]

Hi Simon !

Do you have idea if nrfutil can reboot nRF to normal mode ?

It happens after update automatically but sometimes it need back without update e.g if someone put it to DFU and power ON/OFF is npt possible.

Regards,

Eugene