Updated firmware to 1.93, can't connect.

Please can you run bluetoothd --version?

If I'm honest, sometimes the connection on Linux doesn't work that well, even with newer versions of bluetoothd. Restarting the bluetooth service usually fixes it though.

The other thing you can try is to install the espruino-web-ide module on NPM: https://www.npmjs.com/package/espruino-w­eb-ide

While getting packages set up for the IDE itself can be painful, you can easily run espruino-server and connect to port 8080 - it'll then use noble to make the bluetooth connection, which is much more reliable.