Puck.js problem to save code

For the Puck.js to work again, I just have to connect to the Web IDE and execute load()

Are you sure you didn't insert the battery while holding the button down or something like that?

However it is possible that the error flagged up by the bluetooth stack stops execution of the JavaScript code - in which case I'll need to make a few more changes.

Is this firmware compatible with the MDBT42Q module?

That exact firmware isn't, but I made the changes for all boards, so any cutting edge build at http://www.espruino.com/binaries/travis/master/ will have the changes in, as will 2v04 when it is released.