Apple Stops Signing iOS 15.3 Following iOS 15.3.1 Release, Downgrading No Longer Possible
Following the release of iOS 15.3.1 on February 10, Apple has stopped signing iOS 15.3, the previously available version of iOS that came out in late January. Because iOS 15.3 is no longer being signed, it is not possible to downgrade to that version of iOS if you've updated to iOS 15.3.1.

Apple routinely stops signing older versions of software updates after new releases come out in order to encourage customers to keep their operating systems up to date.
iOS 15.3 was a bug fix update that addressed a significant Safari bug that could leak browsing activity, while iOS 15.3.1 was another bug fix update further addressing WebKit vulnerabilities.
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Following today's release of iOS 14.5.1 and last week's release of iOS 14.5, Apple has stopped signing iOS 14.4.2, the previously available version of iOS 14 released on March 26. With iOS 14.4.2 no longer being signed, it is not possible to downgrade to iOS 14.4.2 from iOS 14.5 or iOS 14.5.1 if you've already updated your iPhone or iPad.
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Following the release of iOS 15.2.1 earlier in January, Apple has stopped signing iOS 15.2, the previously available version of iOS that saw a public release on December 13. With iOS 15.2 no longer being signed, it is not possible to downgrade to that version if you've already updated to iOS 15.2.1.
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The macOS Monterey 12.2 and iOS 15.3 release candidates that came out today appear to address a Safari bug that could cause your recent browsing history and details about your identity to be leaked to malicious entities.
As shared last week by browser fingerprinting service FingerprintJS, there is an issue with the WebKit implementation of the IndexedDB JavaScript API. Any website that uses...
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Apple routinely stops signing older versions of software updates after new releases come out in order to encourage ...
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Top Rated Comments
THIS SHOULD BE ILLEGAL!
Apple support suggest “car issue”, of course… 4 iPhone generations, no problem, iOS 15 on my 13Pro, no problem, iOS 15.3 dissaster!. Will Apple Pay me a new car now that they broke basic Bluetooth calling with a car????