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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.
@Gordon
As @fanoush says really - give it a go in the recovery menu as even if OpenHaystack is causing issues (which is quite possible) it won't be running at that point.
But also maybe just try rebooting your Mac, just in case. Sometimes the Bluetooth stack on the host computer does get into a mess and will refuse to connect.