IPhone phone model and iOS system version can be downgraded by opening downgrade channel in Apple system.

What people didn't expect was that Apple secretly opened the downgrade channel. If you are not satisfied with your current iOS version, you can go back to the original version.

After the actual query, you can clearly see that the old version firmware of iPhone 5, 5S, 6, 6S and 7 series models, Apple has already opened the downgrade channel by default, so if you are willing to return to the original system, bid farewell to the dilemma of limited performance:

iPhone 5 can be reduced to iOS 6.1.3.

2. iPhone 5S can be reduced to iOS 7.0.3;

iPhone 6, 6S and 7 can be reduced to iOS 10.2.

At present, some netizens have successfully measured, it is indeed possible to downgrade, such as iPhone 5S successfully downgraded iOS 8.0 system, but now the server is a bit busy, you may wish to try later, as for when to close is not clear.

Of course, if you want to go back to the old version, the method is simple as follows:

1. Connect the device to the latest version of iTunes with a data cable, then open iTunes

2. Press Shift on the keyboard and click iTunes '"Update" function at the same time;

3. According to iTunes pop-up dialog window, select the corresponding version of iOS firmware, click Update.

In particular, Apple said in an official announcement that iPhone 6, 6 Plus, 6S, 6S Plus and SE models were limited in performance from iOS 10.2.1, while iPhone 7 and 7 Plus were limited in performance from iOS 11.2.

Apple emergency shutdown old iPhone mobile phone system degradation channel verification has been closed

iPhone 5 can be reduced to a minimum iOS version

iPhone 5S can be reduced to a minimum iOS version

iPhone 6 can be reduced to a minimum iOS version

iPhone 6S plus can be reduced to a minimum iOS version

iPhone 7 plus can be reduced to a minimum iOS version