iPhone 8 Plus restore failed - iPhone unavailable
Quick recap: iPhone8 Plus, about 1 year ago, I cracked my screen, my home button stopped working, and didn't want to deal with the repair. I ended upgrading to an iPhone 12. Today I attempted to log on to my iPhone8 but apparently, I forgot my passcode. After 4 failed attempts at trying to unlock my iPhone, I gave up and restored it using iTunes. I have never used iTunes before (as my previous restores have been thru iCloud) but I followed the instructions, and it was going smoothly. Upon finishing the restore my phone restarted and a message said, "iPhone unavailable, try again in 8hrs" Why did it do that? Did I do something wrong?
-Lee
iPhone 8 Plus, iOS 15