Using nrfutil/dfu, I have previously flashed an older application+SD (s132_nrf52_3.0.0) onto the nRF52840 dongle.
Now, I cannot flash my newer application, since it contains a newer SD of another major version (s140_nrf52_6.1.1).
I was attempting to update the SD along with the bootloader, but I cannot find the bootloader hex anywhere.
I attempted flashing the SD+hex from SDK 15.3 (`open_bootloader/pca10059_usb_debug/hex`), but the bootloader complains about not having a signature.
After creating a signature with my signing key, the bootloader fails to parse some packet...
I was able to flash my own application though, which was signed by the same key.
In any case, here are my questions:
1. What is the best way to update the softdevice here? The bootloader is stock, so it should be able to handle anyway
2. How can I update the stock bootloader without having the signing key?
Thanks!
