iPhone 6s stuck in DFU mode after downgrading I'm trying to downgrade from iOS 11 beta 2 back to iOS 10.3.2. I've downloaded the .ipsw from iOS 10.3.2 file from ipsw.me. After that, I've put my iPhone in DFU mode and plugged into my Mac (Sierra 10.12.5). iTunes detected the phone in DFU mode, so then I choose the restore option holding option key and selected the .ipsw file downloaded. The iTunes pass through all process of restoring the phone, but right after it ends, the iPhone restart and go back to the DFU mode. I've tried to download the 10.3.1 ipsw version but the same problem occurred. I've no idea how to proceed.
The short answer is to reinstall iOS 11 - the longer discussion and answer are covered here.


iPhone 7 Plus stuck in recovery mode and can&#39;t restore/update even in DFU


It appears either iPhones can't go back at all or they can't go back today with the current version of iOS 10, iOS 11 and/or current version of iTunes. The iPad Air 2 is the only device I've tried to revert back to 10 - that succeeded.

Past that, I could speculate that it's likely this is firmware and/or secure enclave related but I haven't done the engineering work (or seen another release their analysis) yet. For now, I would urge everyone to not install any of APple's current betas on a device they cannot devote to testing and breakage until the presumed fall release. That includes macOS conversion to APFS, iOS, watchOS and tvOS. Apple announced massive changes to these builds and what worked to go back in the past might either not be tested, not functional or intentionally not allowed.