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Just months before iOS 5 is released and ten days after iOS 4.3.4 came out, one wouldn’t expect to ever hear about iOS 4.3.5. It now turns out that yet another update for iOS 4.3 has been uploaded to Apple’s servers, allegedly fixing a critical security issue.

IPSW

No concrete information about this update has been provided about this update, other than it seems to fix an issue with certificate validation, as pointed out on Apple’s change log:

A security issue has been resolved with certificate verification.

iOS development has been on fire lately, with new updates being rolled out for both iOS 5 betas and iOS 4.3. Over the weekend, iOS 5 Beta was released, containing several enhancements to Apple’s upcoming iOS 5 as the release draws closer and closer. A week earlier, iOS 4.3.4 was released, which contained a security fix for Mobile Safari for a vulnerability that allowed a popular jailbreak method, JailbreakMe 3.0, to function. With 4.3.4 behind us, many has expected iOS 5 to be the next step for iOS but Apple has proven us wrong once again.

While it’s still unclear why Apple hasn’t stopped maintaining iOS 4.3 just several weeks before it’s fully replaced, the only possible explanation could be the gravity of the security vulnerability that was found. Although it might have been Apple’s intention not to update iOS 4 any further, the Cupertino company might have been forced to do it given the circumstances before hackers spotted the vulnerability first and started exploiting it.

If you have a untethered jailbroken device, you are advised to stay as far away from this update as possible.

Non-jailbreak iPhone, iPad, iPod touch users are strongly encouraged to download this update as soon as possible. You can do so by plugging your device into your computer, locating it in the iTunes sidebar and clicking on the "Check for Updates" option. The update should then immediately begin downloading and installing.

Direct Download Links for iOS 4.3.5 (Official from Apple)

Update 1: Tethered jailbreak solution for iOS 4.3.5 is now available. Follow the links below to jailbreak 4.3.5 on iPhone, iPad, iPod touch:

You can read about iPad 2 jailbreak on iOS 4.3.5 here, and about untethered jailbreak on iOS 4.3.5 here.

Update 2: Want to downgrade your device from iOS 4.3.5 back to iOS 4.3.3? Follow our complete write-up posted here.

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