UPDATE : There seems to be a bug in ultrasn0w 1.2.8 when used with iPhone 4 having modem 01.59.00 on iOS 6.1. So Pls. do not proceed with following steps until this gets fixed.

Users relying on Ultrasn0w software carrier unlock can now upgrade to Apple iOS 6.1 as it can now be jailbroken using evasi0n and is now supported by ultrasn0w 1.2.8 update, do keep in mind that you must have the baseband (modem) preserved to one supported by ultrasn0w. Follow the guide posted next to upgrade, jailbreak and unlock iOS 6.1 while preserving the baseband.

Apple has finally fixed the iPhone 4S 3G and battery drainage issue releasing a small 23 MB bug-fix update bumping the latest iOS version to 6.1.1. Good news is the Team evad3rs have also updated their iOS 6.X untethered jailbreak evasi0n to support the latest Apple iOS version 6.1.1.

The update is just 23 MB in size and can be easily fetched using iOS over-the-air (OTA) update feature, after updating users can simply use the updated evasi0n tool to jailbreak iOS 6.1.1 as shown below.

Widespread issue's are now getting reported on Apple community forums as users are complaining of excessive battery drainage and overheating issues after upgrading to Apple iOS 6.1, this is not all Vodafone UK has also issued an warning urging iPhone 4S users to not upgrade iOS 6.1 due to 3G connectivity issues.

While everybody is waiting for an official Apple response and a bug fix update, here are few solutions to fix the battery drain and overheating problem on Apple iOS 6.1.

Evasi0n - The hugely popular untethered jailbreak for Apple iOS 6.X has now been updated to version 1.2, fixing several niggling bugs. The new update is now in-corporated in Windows, Linux and Mac version of the desktop application, users who have already jailbroken there devices using evasi0n can get the upgrade by refreshing and updating from Cydia.

We have now both the Apple iOS 6.1 firmware and it's untethered jailbreak evasi0n, so it's time for an upgrade. Here is an complete noob friendly, step-by-step tutorial with images and video to get the job completed.

evasi0n - The much awaited Apple iOS 6.1 Untethered jailbreaking utility is finally available for download on Windows, Mac and Linux platforms. To get started follow the instructions posted below.

Some good news for Apple iOS users looking to upgrade there iDevices to latest iOS 6.1 but need an untethered jailbreak to enjoy there devices to it's full capability.

Apple iOS 6.1 update is now officially rolled out for public consumption, the update adds LTE (4G) support for 36 additional iPhone carriers and 23 additional iPad carriers worldwide. Other minor changes include ability to purchase movie tickets through Fandango with Siri (USA only), iTunes Match subscribers can now download individual songs from iCloud and new button to reset the Advertising Identifier. Apart from these minor changes the update features numerous other bug fixes and security updates. Direct download links to Apple iOS 6.1 update are posted below.