If you're one of those users who rely on unlock IOS 4.x.x and the need to upgrade to a new software from Apple, iOS 5, it will be necessary to preserve the baseband of the iPhone 4 to keep Your Unlocked. Following are the measures needed to protect the iPhone 4 baseband then upgrade to iOS 5.

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TinyUmbrella for both Windows and Mac has been updated to version 5.00.07 to support save iOS 4.3.5 SHSH blobs for iPhone, iPod touch and iPad. This will help you to save SHSH certificates for iOS 4.3.5 as well as update iPhone 4 baseband. This is the first time updating iPhone 4 baseband functionality has been enabled in TinyUmbrella.

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iH8snow, the developer behind Sn0wbreeze, iREB, and f0recast has just announced that he is working on a new version of Sn0wbreeze that will offer baseband preservation mode. This feature was first implemented in TinyUmbrella which allows preserving iPhone 4 only baseband while upgrading to iOS 4.1 but this tool stopped couldn't preserve the baseband while upgrading to iOS 4.2.1.

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Yesterday we reported you about the possibility of downgrading iPhone 4 baseband 2.10.04 to 1.59.00 to unlock it with ultrasn0w. Few minutes ago, Sherif Hashim the guy behind ultrasn0w unlock tool, has replied one of his fans via his twitter account confirming that work on 3.10.01 baseband is in progress.

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As most of you know, that iPhone Dev-team is working on two important tasks, untethered jailbreak for iOS 4.2.1 on all iDevices and iPhone 4 baseband 2.10.04 unlock. MuscleNerd has replied via his twitter to someone who asked him about the capability of downgrading iPhone 4, Let's check out how MuscleNerd replied him.

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Apple has release iOS 4.2.1, but not alone, it has merged some traps with this version for jailbreakers and unlockers with the introduction of a baseband requirement for iOS 4.2.1. Precisely, if you are using Saurik’s server or tiny umbrella and trying to restore 4.2.1 on an iPhone 4, you will end up in recovery mode and tiny umbrella will not be able to pull you out of recovery.

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