Do not update: iOS 8.0.1 cripples iPhone 6 and 6 Plus by killing Touch ID and cell service | iMore

Update: If you've already updated, here's how to restore in iTunes and fix iOS 8.0.1 Touch ID and cell issues. If you haven't, Apple has pulled iOS 8.0.1 — even if it shows as available on your phone, don't do it. Do not install the recently-released iOS

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