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Hello Gordon, thank you for your reply.
No, didn't do anything except wore it all week and it was working perfectly, notifications coming through, alarm working etc.
BTW sorry if I wasn't clear on the previous post, but although I didn't really use it, it was charged intermittently.
Rebooting through bootloader, it shows the start screen (the one with "Bangle" and a picture of a watch) and then "uncaught error I2C", which fills the screen.
Pressing the button again takes it back to the clock.
I can press the button again to get the apps menu but can't scroll or touch anything so can'r access the flatten battery option.
Did you do anything with the watch between it working and not working? And does the screen look ok, or does it have different coloured patches on it? I guess it could be that if the battery had problems from being left those 3 years uncharged and then it swelled up, that might affect the touchscreen performance.
Please can you try long-pressing the button (~15 seconds) so it reboots, goes through the bootloader and boots back up into the recovery screen (you need to release the button as soon as you see the screen).
And does it scroll when you do that? That would help to discount the effect that any software might have.
You could also try going to
Settings -> Utils -> Flatten Battery
and leaving the battery to go completely flat, which would cause the touchscreen to have a full hardware reset, just in case it was something related to that.