We have an iPhone 6 with a similar issue. It is running an older than current iOS, and Apple dropped iOS security update support it about 4-months ago. Any luck getting your 5S to work? Seems silly to have to buy an iPhone SE Gen3 off eBay but maybe it is worth it.
commas
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@Quinn, yes, we are seeing misagent crashing.
We purchased a new iPhone SE Gen 3 and we still get the error. The latest is attached.
Crash Report.rtf