AI News Feed
Market watch
A Switched-Off PC Is Still at Risk in a Blackout, Engadget WarnsLaptop fan noise usually signals cooling under load, but rattling or idle roar may need repairSeoul Stocks Open Sharply Higher as Chip Shares Rally on Revived AI OptimismDeepSeek Seeks 50 Billion Yuan Round and Bets on Huawei Chips; OpenAI Forms Math Advisory GroupDeep-Sea Drone Floats Could Sample 98 Percent of Ocean Volume by 2028Apple Store Builder Ron Johnson Pushes Back on Silicon Valley's AI Shopping Bet
A Switched-Off PC Is Still at Risk in a Blackout, Engadget WarnsLaptop fan noise usually signals cooling under load, but rattling or idle roar may need repairSeoul Stocks Open Sharply Higher as Chip Shares Rally on Revived AI OptimismDeepSeek Seeks 50 Billion Yuan Round and Bets on Huawei Chips; OpenAI Forms Math Advisory GroupDeep-Sea Drone Floats Could Sample 98 Percent of Ocean Volume by 2028Apple Store Builder Ron Johnson Pushes Back on Silicon Valley's AI Shopping Bet
Companies

Apple Stops Signing iOS 26.6.2, Closing Official Downgrade Path From iOS 27

Apple stopped signing iOS 26.6.2, blocking official downgrades from iOS 27 to iOS 26, 9to5Mac reported.

AI News Feed · 2026-09-22 09:53

Signing is part of the installation process for iOS. When an iPhone user tries to install a version of the operating system, the device checks with Apple's servers to confirm that version is still authorized. The same check applies whether the user is upgrading or downgrading.

Apple keeps a short list of signed iOS versions because iOS updates often patch known security vulnerabilities. By limiting which versions remain signed, Apple prevents users from installing or downgrading to older builds that may contain flaws attackers could exploit.

With iOS 26.6.2 no longer signed, users running iOS 27 can no longer downgrade to it. According to 9to5Mac, that effectively closes the window for official downgrades to iOS 26.

Apple released iOS 26.7 last week. However, the company currently does not officially offer a restore image for iOS 26.7 on iPhone, unlike iPadOS 26.7, the report said. In practice, that means iPhone users who are still on an earlier version of iOS 26 can install iOS 26.7 as an over-the-air update, but users already on iOS 27 cannot officially use iOS 26.7 to downgrade.

The signing requirement is separate from the ability to obtain an iOS update file. Even if an older version is available elsewhere, an iPhone will not complete installation unless Apple's servers authorize it. Apple withdrew that authorization for iOS 26.6.2. The result is that users who have already moved to iOS 27 cannot officially return to iOS 26.