No way to exit Settings app on T58A

[CFortC]

I ended up resetting to factory, reinstalling the correct latest version of the firmware, and for good measure, repeated both those steps. This process managed to exorcise the remaining devils and the phone and firmware now operates normally.

I believe I know how the error mode was instigated. I had previously accidentally installed the Microsoft Teams version of the firmware. That version is not actually supported on this hardware platform but it installed anyway. When I realized the error and reinstalled the correct (non-Teams) firmware, that's when my troubles began.

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