How can I go back to previous iOS version (from iOS 15.0)?
Unfortunately, my online bank service app doesn't work on iOS 15, and they're apparently gonna fix the issue around september. Using that app is really important to me, so I need to get back to the previous iOS version... Could someone give me even somewhat simplified instructions on how to do that? I'm feeling so hopeless, because I'm not a tech guru.
Thank you in advance!
iPhone XS