My iPhone is unavailable for 8hours
My iPhone is unavailable for 8hours but the timer is not going down and I can’t do anything to get it to my phone
Turn your phone off and on and wait.
If there is a message saying "iPhone unavailable" and the timer still does not decrease.
Put the device in DFU mode and connect it to iTunes. And restore the iPhone. Make sure you back up your data and know your passwords.
After restoring your iPhone, the data backed up via iCloud will be restored.