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I am at the same step. Flashing bootloader seems fine. I think windows probably needs a driver. Will look a bit more.
Just occurred to me that the problem is probably that I have never ran an official Espruino device. The driver that would normally install on first run is probably not installing. Will try that.
I tried to flash AkosLukacs's hex file from this page to my nrf52840 dongle using nrfutil:
it says that the device was programmed succesfully, but I can't connect to it (I do not see any BT device nor any COM port I can connect. the only port I see is the one I used for programming showing nRF52 SDFU USB (COM5))
any hint what can be wrong ?
thank your any advice...