Last week, Apple hadrelease update iOS 15.6.1 The latest Apple has blocked the downgrade to iOS 15.6 already.
For iOS 15.6.1 update, it fixes the vulnerabilities that have been attacked in all 2 major ones. The update will increase the security for users.
In addition, if anyone who has updated to iOS 15.6.1 and has some problems It is recommended to wait for the update from iOS 15.6.1 in the future.
Source: 9to5mac