Surprisingly, Apple has released IOS 5 beta 5 (build 9A5288d) Saturday. Usually, Apple released a new beta version to developers on weekdays. In addition to those releases
is the Xcode 4.2 Developer Preview 5, iTunes 5.10 Beta 5 and Apple TV Software beta 4.

This update is available OTA (over the air), but according to the records release, users must delete all content and settings by selecting Settings > General>
Reset > Erase All Content and Settings. Apple recommends to backup the iPhone users through iTunes or through the 5.10 beta 4 iCloud, and then restore again. But it said, some users can upgrade without going through the process of this new update provides fixes several bugs, but no major new features.

But there is a new mode of Hearing Aid Mode. OTA update of IOS 5 beta 4 to beta 5 size 128MB.