See my device in list but connect returns Device connection failed invalid JSON in the bottom of the screen.
That sounds promising at least - definitely worth trying again as @nicoboss says.
It'd be really handy to see what the browser is saying in the Debug Tools. Doing that on Android is a pain, but if you can get the JSON message on desktop maybe you can open the debug tools and see what's being printed?
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.
That sounds promising at least - definitely worth trying again as @nicoboss says.
It'd be really handy to see what the browser is saying in the Debug Tools. Doing that on Android is a pain, but if you can get the JSON message on desktop maybe you can open the debug tools and see what's being printed?