Update iPhone 8 from iOS 14.4 to 15.8

[violet basalt]

im trying to update my iphone 8 from ios 14.4 to ios 15.8 would there be any way of upgrading as dahlia profile isnt woring

[wispy basin]

Can't. 15.8 was never on the iPhone 8

If you mean 6s or 7, then just updating works