Hi - is there literally nothing on the screen at all?
Please can you try http://www.espruino.com/Bangle.js#resetting-without-loading-any-code and see if you can get anything to appear on the screen at all? It's usually pretty much impossible to 'brick' it since the bootloader won't overwrite itself.
Also, did you try charging it? It's possible the battery just happened to run flat?
Could you confirm which firmware you flashed too? It'd be handy to know the filename if you still have the file around. Was it the standard 2v09 Bangle.js firmware, or was it the cutting edge one?
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