The iPhone 4 iOS 4.1 Beta2 firmware has been released along with the SDK for iPhone 4 , iPhone 3GS , iPhone 3G, and iPod Touch 3G and is made available for download to iPhone application developers . If you are member of iPhone developer Standard or iPhone developer Enterprise program you can download the latest firmware iOS 4.1 beta 2 ( build 885091b ) for your iPhone 4 , iPhone 3GS , iPhone 3G , iPod Touch now .

Check out whats new in the update :
The iOS 4.1 Beta 2 Change Log
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iOS 4.1 Beta 2 contains a new baseband 05.14.01_BL01 for iPhone 4, 3GS and 3G.If you rely on an unlock, DO NOT update to Beta 2.
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Gizmodo is reporting that iOS 4 beta 2 build has fixed the proximity sensor issue which was annoying some iPhone 4 users since launch.
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The Next Web is reporting that iOS 4.1 may have fixed the slowness issue of iOS 4 /4.0.1 on iPhone 3G.
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Fixed bug of displaying the MMS on iPhone 3G. In the previous version, the image contained in multimedia messages, was not displaying correctly.
This update is not recommended for users who have already unlocked their iPhone or they may loose the unlocked device and get it locked again .
If you wish to Download the iOS 4.1 Beta 2 & SDK visit the iPhone developers section here .
If any of the iPhone application developer has tested this built and figured out something new , please share with us in our comments section ..
