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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.
@user141569
It sounds like you didn't actually break the firmware, just the JS code that gets run on boot. The files that get run are described here.
Follow the procedure to reset without loading any code. That should get you to a Banglejs logo screen. From there, use the IDE to delete any of the following that exist: .varimg, .boot0, .boot1, .boot2, .boot3, .bootrst, and .bootcde. (You probably only have .boot0 and .bootcde.) Then, go to the app loader and reinstall the Bootloader app. That should fix it.