Apple Stops Signing iOS 14.5 Following Bug Fix iOS 14.5.1 Release
Following the release of iOS 14.5.1 last week, Apple has stopped signing iOS 14.5, the previously available version of iOS 14 that was released in late April. With iOS 14.5 no longer being signed, it is not possible to downgrade to iOS 14.5 if you've already installed iOS 14.5.1.

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 14.5 was a major update introducing a whole slew of new features from an option to unlock an iPhone with an Apple Watch while wearing a mask to Apple Maps accident crowdsourcing. The software also added dual-SIM 5G support, new emoji, AirTag support, and tons more.
iOS 14.5.1, the update that replaces iOS 14.5, addressed an App Tracking Transparency issue that prevented some users from receiving prompts from apps and it included fixes for two WebKit security vulnerabilities. Apple last week also stopped signing iOS 14.4.2.
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Top Rated Comments
14.5.1 is a mess. Macrumors needs to run an article.
This happens when Amnesia Siri is assigned to your device. Just to spice things up, there are different Siri personalities in rotation. The most common ones are:
Stupid Siri (I don’t know what you mean)
Amnesia Siri (where she doesn't know how to do something she could do 5 minutes earlier)
Too busy for you Siri (when she answers: just a moment…)
Crying wolf Siri (Something went wrong, when everything is fine)
Detox Siri (where she refuses to connect to the internet while you’re on 5 bars)
Obnoxious Siri (where she all of a sudden asks you which phone number to use to call your boyfriend when you always use the mobile number)
and the one I hate most:
trying to be funny Siri (when you ask her to remind you about this and she creates a reminder titled ‘this’)
just try again 5 minutes later and hope you’ll get a different Siri.
For me on iOS 14.5.1 Siri interrupts each time itself after I dictated her a message in CarPlay.