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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.
cimbo-sbt
Ok, this happened to someone else. I'm still not 100% sure how - but basically there was a bug in 'Show Debug Info' which caused the watch not to be contactable.
However somehow the watch/settings app has managed to get removed, but not the code that looks at the settings and causes the problem.
All you need to do is update the Espruino firmware itself, to the latest build from: http://www.espruino.com/binaries/travis/master/
After that, you can boot while pressing BTN1 (as you did before), but NOW the watch will be contactable and you can re-upload all the apps.