After the release of iOS 11.2.1, apple began to shut down the old system verification channel. After iOS 11.1 and the following version of the verification channel closed, apple 16 closed iOS 11.1.1 and iOS 11.1.2. This means that a new system to install iOS 11.2 has become impossible, and relegation is not possible.

It is worth mentioning that Google had previously said that it had discovered a flaw in apple's iOS 11 system that would allow iOS 11.1.2 to escape, which may be related to this reason.

After the release of iOS 11.2.1, apple began to shut down the old system verification channel.

After iOS 11.1 and the following verification channels were closed, apple today shut down iOS 11.1.1 and iOS 11.1.2.

This means that a new system to install iOS 11.2 has become impossible, and relegation is not possible.

It is worth mentioning that Google had previously said that it had discovered a flaw in apple's iOS 11 system that would allow iOS 11.1.2 to escape, which may be related to this reason.