How to Fix the "iPhone Unavailable…
https://www.howtogeek.com/849546/how-to-fix-the-iphone-unavailable-screen/
What to do if iPhone says unavailable: Wait for the timer to expire and enter your passcode correctly. If you don't see a timer, you need to erase your device and restore it from your most recent backup. If you forgot your iPhone's passcode or it's been unavailable, you'll have to reset it to use it. Put the iPhone into recovery mode. Once connected to the computer, keep holding the button until you see the recovery mode screen appearing on the iPhone, then let go.
Wait for the timer to expire and enter your passcode correctly.
If you don't see a timer, you need to erase your device and restore it from your most recent backup.
If you forgot your iPhone's passcode or it's been unavailable, you'll have to reset it to use it.
Put the iPhone into recovery mode.
Once connected to the computer, keep holding the button until you see the recovery mode screen appearing on the iPhone, then let go.
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