how to jailbreak iphone?

Wait for unc0ver to be resigned or use taurine,

If this doesnt work use checkra1n, its not untethered though.

Also theres a good possibility that unc0ver isnt expired its just youre on an unsupported device, unc0ver is only for 14.3, chip doesnt matter.

Breaking out of jail might be faster than waiting for a13 14.5+to have a compatible jailbreak