Apple has released the fourth iOS 5 beta version. For the first time you can get it as a OTA update (133MB) in addition to the standard download and install process via iTunes.
Actually, if you have an iOS 5 beta 3 running device, you should be already notified about the new update.
The iOS 5 beta 4 fixes some bugs, improves the performance and iTunes Wi-Fi sync now works on Windows too.
The OTA update process takes about 10 minutes and requires at least 50% battery or a power source connection.
There is one more thing – redsn0w has been updated to jailbreak the new beta 4 and as usual it’s a tethered one too.