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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
Recently I tried espruino on particle xenon (nrf52840) and I had same issues with conecting from Raspberry Pi 3 and 4 and found solution/workaround for this strange error. I cleared bluez cache in /var/lib/blueooth as per https://stackoverflow.com/a/43541073 and problem is gone. I had cached files for various devices more than year old there. Not really sure why Bluez caches stuff like this for so long (or at all). So now I can connect to any softdevice version used with espruino without issues.
BTW I understand how it might affect things when switching different bluetooth versions (4 to 5) for same device and MAC address, however with particle xenon this was first connection ever that was failing, yet clearing the cache somehow helped too.