I had a similar problem yesterday when trying to update my Bangle 2 (kickstarter version) to firmware 2v14 via the App Loader page. I got the watch working again by updating to the earlier version. (2v13).
I used the App Loader as well that time. Perhaps it was related to that?
In any case, the manual firmware update via the nrfConnect app worked for me. I am now on stable 2v14.
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I had a similar problem yesterday when trying to update my Bangle 2 (kickstarter version) to firmware 2v14 via the App Loader page. I got the watch working again by updating to the earlier version. (2v13).