Apple has released firmware 2.2.1 for iPhone with minor bug fixes and improvements. The upgrade is now available for download via iTunes.

In brief, this update includes:

• Improved general stability of Safari
• Fixed issue where some images saved from Mail do not display correctly in the Camera Roll

For user with jailbroken or unlocked iPhone, please do not upgrade to this firmware version yet. Even iTunes prompts you for the upgrade, just cancel it. This new firmware update will break the unlock of iPhone 3G using yellowsn0w as warned by iPhone Dev Team. Also, for iPhone 2G user, I suggest you to hold the upgrade until we got more updates from the developers of QuickPwn & PwnageTool.

Update: You can now jailbreak firmware 2.2.1 using the latest version of QuickPwn and PwnageTool. For more information, please check out “Jailbreak Guide Updated for firmware 2.2.1″

Anyway, this is not a big firmware update. If you’re already on firmware 2.2, just stay with it. And, for those who’re planning to upgrade the firmware version, you can consider to upgrade to firmware 2.2 and jailbreak it using QuickPwn or PwnageTool.

Stay tuned. I’ll keep you update on any news about the firmware upgrade.

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• Jailbreak Update: So, can we Upgrade to iPhone 2.2?
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• iPhone 2.2 Upgrade: Jailbreak iPhone 3G using QuickPwn… Please Take Note

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