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Apple today has released iOS 4.0.1 to fix the much talked about iPhone 4 reception issue which has been plaguing users since its launch last month. Apart from this fix, nothing much has been added and so if you are an iPhone 3GS or iPhone 3G user, and you rely on a jailbreak and unlock, it is better to avoid this upgrade until new jailbreak and unlock tools are available. Comex – the guy behind Spirit jailbreak tool for iPad and iPhone / iPod touch is expected to release an update to Spirit, which will jailbreak iOS based devices on the latest firmware.

Comex: 3.2.1 and 4.0.1 out. if you want an unlock, DO NOT UPDATE. No, the jailbreak is not ready yet.

iPhone 4 (1)

Also, if you are an iPhone 3G user who doesn’t rely on a carrier unlock, you can use Redsn0w 0.9.5b5-5 to jailbreak your iPhone on iOS 4.0.1, instructions for which are similar to any of the releases like iOS 4.1 and iOS 4. Simply follow the guide posted here to jailbreak your iPhone 3G and iPod touch 2G (non-MC model) on iOS 4.0.1.

UPDATE 1: After thorough testing, it turned out that baseband and modem firmware for all iPhones hasn’t been updated in iOS 4.0.1 since iOS 4. What this basically means is that you can still unlock your iPhone on any baseband using ultrasn0w, guide for which can be found here. But since currently there is no jailbreak tool available for iPhone 4 and iPhone 3GS (new bootrom), and the current jailbreak tools for iPhone 3GS (old bootrom) are not compatible with iOS 4.0.1 yet, so the only device which can be currently be jailbroken and unlocked on iOS 4.0.1 is iPhone 3G, guide for which can be found here.

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