Espruino command-line tool

Hmm, that should be fine then. When the Pico freezes it's probably stuck in the middle of entering a function, with echo off.

Try [Ctrl-C] echo(1) [enter] and that may fix it - you might also be able to see what it was entering.

As you've got the EspruinoTools source handy, you could try this: https://github.com/espruino/espruino-too­ls/issues/6#issuecomment-101716152

It's a bit of a hack, but it seemed to work in that case.