What if you don’t have a computer

Do "it"? I presume reset an iOS device as in? --> If you forgot your iPhone passcode - Apple Support

If you end up having to use a computer and you do not have one, borrow one from a friend, or go to an Apple Retail Store or Apple Authorized Service Provider. You can also use a PC with iTunes.

peightn Said:

"What if you didn’t have a computer to do it??"

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What exactly is it your are looking to do? Ask a friend if you may use theirs.