For apple, after the release of the official version of IOS 14.4, it will stop verifying the previous version. Before, they also played like this, just to encourage users to update.Judging from the current situation, Apple has stopped verifying IOS 14.3, which means that if you have upgraded, you can't downgrade from IOS 14.4 to IOS 14.3.Last week, Apple launched IOS 14.4, which is a big blow to the third-party unofficial after-sales of iPhone.
(Fig. via)Apple Insider）
At the same time, apple shared a supporting document that emphasized the importance of having to be repaired by trained technicians and using Apple's original parts.