Apple has released a few hours the new version of its firmware, but only for developers, iPhone OS 5.1 . beta 2. As always, the beta firmware Apple is dedicated to developers who may try to preview and test their app on those who later become release candidates.
Apple, in this new firmware version , tentado is to solve the serious problems of lack of autonomy of the battery as well as other bugs reported by the developers. In addition to fix problems with iPhone OS 5.1 Apple will allow you to delete images from Photo Stream.