Apple: Difference between revisions

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===Operating system downgrades===

It is not possible to upgrade or downgrade an iPhone, iPad, Apple TV, etc. to an Operating System (OS) version ~~other than~~ the most recent. On Macs with T2 chip or Apple Silicon, the user can select from three modes of secure boot:<ref>{{Cite web |title=About Startup Security Utility on a Mac with the Apple T2 Security Chip |url=https://support.apple.com/en-us/102522 |url-status=live |archive-url=https://web.archive.org/web/20250607083624/https://support.apple.com/en-us/102522 |archive-date=7 Jun 2025 |access-date=22 Jun 2025 |website=Apple}}</ref>

It is not possible to upgrade or downgrade an iPhone, iPad, Apple TV, etc. to an Operating System (OS) version that is no longer signed by Apple. In most cases, only the most recent version is signed. Some exceptions exist, such as certain Apple TV models and Apple Silicon Macs. Downgrading the Apple TV 4K series is not possible at all due to the lack of a USB port. On Macs with T2 chip or Apple Silicon, the user can select from three modes of secure boot:<ref>{{Cite web |title=About Startup Security Utility on a Mac with the Apple T2 Security Chip |url=https://support.apple.com/en-us/102522 |url-status=live |archive-url=https://web.archive.org/web/20250607083624/https://support.apple.com/en-us/102522 |archive-date=7 Jun 2025 |access-date=22 Jun 2025 |website=Apple}}</ref>

*No security: Allow any OS to run (same as turning off secure boot on a PC).

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 ===Operating system downgrades===
-It is not possible to upgrade or downgrade an iPhone, iPad, Apple TV, etc. to an Operating System (OS) version other than the most recent. On Macs with T2 chip or Apple Silicon, the user can select from three modes of secure boot:<ref>{{Cite web |title=About Startup Security Utility on a Mac with the Apple T2 Security Chip |url=https://support.apple.com/en-us/102522 |url-status=live |archive-url=https://web.archive.org/web/20250607083624/https://support.apple.com/en-us/102522 |archive-date=7 Jun 2025 |access-date=22 Jun 2025 |website=Apple}}</ref>
+It is not possible to upgrade or downgrade an iPhone, iPad, Apple TV, etc. to an Operating System (OS) version that is no longer signed by Apple. In most cases, only the most recent version is signed. Some exceptions exist, such as certain Apple TV models and Apple Silicon Macs. Downgrading the Apple TV 4K series is not possible at all due to the lack of a USB port. On Macs with T2 chip or Apple Silicon, the user can select from three modes of secure boot:<ref>{{Cite web |title=About Startup Security Utility on a Mac with the Apple T2 Security Chip |url=https://support.apple.com/en-us/102522 |url-status=live |archive-url=https://web.archive.org/web/20250607083624/https://support.apple.com/en-us/102522 |archive-date=7 Jun 2025 |access-date=22 Jun 2025 |website=Apple}}</ref>
 *No security: Allow any OS to run (same as turning off secure boot on a PC).