I asked this to the helpful people of Reticulum in practice Matrix channel but even with a lot of back and forward I still couldn't manage to make them work. You can flash them eventually if you just spam the command 15 times, but trying to pair it with bluetooth or use it through a serial connection then causes the Rnode basically bricks itself and no long responds to serial commands through rnodeconf
The only major discovery we managed to find was that flashing it once half breaks it (it'll show up a debug name as the serial name after you first attempt to flash it and attempting to flash afterwards doesn't really do much) and only after reflashing with meshtastic do you actually reset back to how the chip was originally.
This chips are experimental for Rnodes and are otherwise considered very buggy so this may just be a firmware issue that will eventually fix itself
If you have at all gotten this chip to work, please say how you successfully flashed them

