You are reading a single comment by @fanoush and its replies.
Click here to read the full conversation.
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@fanoush
the
espruino_2v09.134_nrf52840.hexis most probably full hex file with softdevice included. to build--applicationdfu zip you should take the intermediate file called espruino_2v09.134_nrf52840.app_hex which is only the application.Also the softdevice version must match what adafruit bootloader currently uses. Or if it doesn't use any softdevice (the newest one can be build like that?) you probably need to flash matching softdevice too - make another zip package with
--softdevicesoftdevice.hex , not--applicationand flash both zips separately. see the end of espruino build output for file names, you should see mergehex running.or alternatively it may be easier to convert full hex file you have to uf2 instead of dfu zip and flash that over usb as per https://github.com/adafruit/Adafruit_nRF52_Bootloader#making-your-own-uf2