Apple has seeded iOS 5.1 firmware beta for developers . iOS 5.1 brings some API changes and improvements to battery and iCloud support . The update is available for iPhone 4S , iPhone 4 , iPhone 3GS , iPad 2 , iPad 1st generation , iPod Touch 4G and iPod Touch 3G . iOS 5.1 beta is current available for download in Apple Dev Centre and requires a Dev Account for activation .
After digging into the system files on iOS 5.1 , folks at 9to5mac blog found some instances mentioning iPhone 5 in the codes . The references are highlighted in the image below . There are also mentions of iPad 3 .
You can download iOS 5.1 beta ipsw directly from Apple Dev Centre. Activation requires a valid UDID (device unique identifier) registered under a developers account which costs $99 per year . iOS 5.1 Beta is available for testing only and will expire on January 14, 2012 at 8:00PM (EST) .
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