Apparently, Apple developers did not just eat their own bread. Today, the company has rolled out another test version of upcoming iOS 6.1 and now you can download iOS 6.1 beta using direct links and without developer account. Assembly is available for all officially registered developers but here you will be able to download iOS 6.1 IPSW without it. Along with beta update Apple released new Xcode 4.6 Developer Preview 4 and the new test firmware for the Apple TV. You can download and install iOS 6.1 beta 4 for iPhone 5, iPhone 4S, iPhone 4 and 3GS, iPad second, third and fourth generation and iPod touch. Those who uses iOS 6.1 beta 3 can download the update over the air (OTA) by going to Settings -> General -> Software Update. The size of delta update can vary from 50 to 100 MB, depending on the device (IPSW file weighs about 1 GB). Official list of features of iOS 6.1 beta 4 build 10B5126b limited by the phrase "bug fixes and other improvements." But, according to the first reviews of developers in iOS 6.1 beta 4 has improved battery life of iPhone and iPad, which of course is good. After installation it became clear that there is nothing new. However you can notice that it was added support for Thai, fixed Push Notification when working with Exchange accounts. Previously, the problem could occur when switching between mobile Internet and Wi-Fi network but now it doesn't. The reset button of advertising identifier now is available in Advertising Settings tab in Settings. Release the public version and iOS 6.1 features you will enjoy in a few weeks. As noted by hacker iH8sn0w, validity of the new test firmware ends in January 28, 2013. By this time, probably, Apple has already released a public version of iOS 6.1. Download iOS 6.1 beta 4 for iPhone, iPod touch and iPad can only authorized developers involved in the programs of iPhone Developer Standard or Enterprise Program. If you are a registered developer, you can get iOS 6.1 beta 4 through iOS Dev Center here. But if you don't have such account be patient because soon I will give this possibility below: iOS 6.1 beta 4 iPhone 5 GSM / CDMA iOS 6.1 beta 4 iPhone 4S iOS 6.1 beta 4 iPhone 4 GSM / CDMA iOS 6.1 beta 4 iPhone 3GS iOS 6.1 beta  4 iPad Mini WiFi / WiFi+Cellular iOS 6.1 beta 4 iPad 2 WiFi iOS 6.1 beta 4 iPad 2 WiFi + 3G GSM iOS 6.1 beta 4 iPad 2 WiFi + 3G CDMA iOS 6.1 beta 4 iPad 2 Rev A iOS 6.1 beta 4 iPad 3 Wi-Fi iOS 6.1 beta 4 iPad 3 AT&T iOS 6.1 beta 4 iPad 3 Verizon iOS 6.1 beta 4 iPad 4 WiFi / WiFi+Cellular iOS 6.1 beta 4 iPod touch 4 iOS 6.1 beta 4 iPod touch 5 That's it. Soon you provide you with tutorial guide on how to jailbreak iOS 6.1 beta 4. Stay tuned with us and you will be the first who download new beta 4 build 10B5126b.