Repairer broke my phone

‘Security’ as applied by some apps fail in phones that are not deemed to be ‘secure’ but ‘the app’ (provider) will not divulge what that test might be. Rather than summarise it again, consider whether one or the other iPhone might have an issue sooner or later than the other, regardless of chipsets.

It is probably related to security update services being ‘active’ or ‘expired’ for the product.