Microsoft MakeCode

Bootloader Flashing Error - Nordic USB Dongle

H Team,

Im trying to flash the pre boot-loader from here

for my nordic usb dongle.
hex-> mdk_nrf52840_dongle_bootloader-0.3.2_s140_6.1.1.hex
Im getting the DFU error.
DFU failed: Error message for known extended error code from DFU target: The init packet does not contain a signature. This bootloader requires DFU updates to be signed.

Please help on this.
Ashok R

I would suggest to ask this on Adafruit discord.