Firmware updater app updated invalid Bangle.js firmware

[tompusey]

Affected hardware version

Bangle 2

Your firmware version

2v16

The bug

Just updated firmware to 2v16 using firmware update app on https://banglejs.com/apps, when the watch reboots after updating it's now stuck looping the following text on screen. I can no longer connect via bluetooth and when I try to boot into DFU mode the same thing happens.

WATCHDOG
DFU 2V12

CHECK STORAGE
NO NEW FW

BOOTING...

then it loops over and over

[tompusey]

also tried resetting without loading any code instructions on https://www.espruino.com/Bangle.js2#resetting-without-loading-any-code still boot loops

[gfwilliams]

Hi - sorry about this, but it sounds like somehow the main Bangle.js firmware has got corrupted during the update, and you'll have to use the 'fallback' firmware update method.

Please can you follow the instructions at http://www.espruino.com/Firmware+Update#nrf52 - you'll need to update from an (ideally Android) phone or tablet.

[tompusey]

That was so much easier to fix than I was expecting. Everything is working now. Thanks for the rapid response.

[gfwilliams]

Great! Glad it's sorted now!

I'll leave this issue open though and I'll take another look at the code - very rarely it seems this does happen (that the firmware updater can update with invalid data). There are a bunch of checks in there to avoid it, and I've never been able to reproduce it here, but I'll see if there's anything else I can do to make problems even less likely.