Apple hasn't forgotten about some older iOS, iPadOS, and macOS versions
At the same time as updating its current operating systems, Apple has issued a few updates for older versions of iOS, iPadOS, ...
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Download: iOS 18.4 Final IPSW Links, OTA Update For iPhone, iPadOS 18.4 For iPad Released
You can now download iOS 18.4 final IPSW links and OTA update for iPhone, as well as iPadOS 18.4 final for iPad. Here are the details on this release.