iPhone unavailable
How can I hand flash my iPhone without pc or Mac when it is iPhone permanently unavailable after someone tries to unlock my iPhone when attempting 10 times
If you forgot the passcode on your iPhone, or your iPhone is disabled or unavailable -
Click on the link for instructions on how to reset your passcode without a computer if you have iOS 15.2 or higher.
If you see an iPhone or iPad unavailable message or Security Lockout screen - Apple Support
If you can't use that method, then you will need a computer. Ask a friend who has a computer if you can use theirs or go to an Apple store and use one of their computers.
Click on the link for instructions on how to reset your passcode using a computer.
If you forgot your iPhone passcode, use your Mac or PC to reset it - Apple Support