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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.
@Gordon
Argh, yes - sorry. There's a change log here: http://www.espruino.com/ChangeLog
But yes, Bangle.js 2 has a 3 bit display. However it was causing a lot of difficulties as basically everything (including icons) had to be specifically 3 bit only - any normal icons would render really badly.
So, to work around this I added dithering. 3 bit images/colors render as-is, but any color inbetween gets dithered. However to dither, the colors have to then be more than 3 bits, and it seemed to make sense to use the same 16 bit depth so things like the theme colors didn't vary between devices.
I tweaked the settings to set the theme in a more bpp-agnostic way: https://github.com/espruino/BangleApps/blob/master/apps/setting/settings.js#L184-L194
But unfortunately you've got stuck in the middle a bit - as you were on hardware that I haven't yet pushed out to everyone I didn't bother too much about safety-checking the changes.
If you delete the settings file chances are it'll come back up with the defaults and you'll be good to go though - sorry about that. Thinking about it
g.getBPP()should probably still return 3, even though internally the current color are stored as 16 bit.