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Apple unsigns iOS 18.6, preventing downgrades from iOS 18.6.1 or 18.6.2

iOS 18 downgrade.

Apple stopped signing iOS 18.6 on Thursday, just one week after releasing iOS 18.6.1 alongside watchOS 11.6.1 to enable the Blood Oxygen monitoring feature on Apple Watches that were previously barred from offering the feature to end users under an International Trade Commission ruling – but later circumvented by a U.S. Customs and Border Protection ruling that patent troll Masimo is now once again suing over.