Apple in order to ensure the update rate of the iOS system, so every time Apple releases a new system, Apple will close the verification channel of the old iOS system, after closing the verification channel, the device updated to the new system will not be able to downgrade to the old system.
Although Apple's wave of operations has been complained about by many users, Apple still goes its own way.
However, recently some netizens found that Apple does not seem to have completely closed the iOS system verification channel, because the iPhone XS Max National Bank Edition iOS 14.1 (18A8395) system verification pass has not been closed.
However, here we need to pay attention to the fact that although the verification channel of the iOS 14.1 system is not closed, not all iPhone XS Max models can be downgraded, and after netizen testing, it is found that only the iPhone XS Max version of the two networks of the National Bank of China can be downgraded.
It's just that the iPhone XS Max model of the two networks is really rare, after all, we generally buy three networks of iPhone phones, so even if Apple does not turn off the iOS 14.1 system, this is also very chicken.
Since I don't have the iPhone Xs Max of the Two Networks, I won't test it. However, if you happen to have this model and want to downgrade to iOS 14.1, then please make a backup before downgrading to avoid data loss after flashing.