Happening to me as well, checked every thread here as well as on a few other forums. Update installed fine, phone still works, just get the continous attempts to update firmware fail. Reset my cache, did a factory reset, no change after either. Phone is a carrier unlocked T-Mobile (SM-960UZBAXAA) on Google Fi, IMEI checks out but I did purchase it from a acquaintance so it did switch #s and carriers and I don't have any info about when it was taken off of T-Mobile. It seems like this is happening to people with unlocked T-Mobile devices, so I'm going to try and find someone local with a T-Mobile SIM to test but that will take a while.
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