Once you stop signing a version of the operating system, you cannot roll back to a later version; becomes technically impossible.
Apple released OS 17.3 on January 22, which includes new features including protection against device theft. When this feature is enabled, your device requires authentication with Face ID or Touch ID to change your Apple ID password and turn off Find My.
In general, de-signing of older versions is necessary to protect accounts and personal information in case an iPhone is stolen. Rolling back to an older version is a jailbreak; fixing errors, accessing files, etc. after an update. It is a “special hack” used for. Although Apple does not support this, many users use this method.
Source: Ferra
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