Apple has released another version of the iOS 5.1.1 software for GSM versions of the iPhone 4 only, reports iPhone hacker iH8sn0w. This update is build number 9B208 and no information is known about it at this point.

This update was previously released on May 7th, and featured a list of improvements including improvement of HDR reliability when using the lock screen shortcut, AirPlay fixes and a security patch for a Safari exploit.

Apple has, from time to time, found issues with iOS builds and re-released them for update to devices. That may be what triggered this update.

GSM iPhone 4 users, that’s AT&T customers here in the U.S., can get the update by tapping Settings>General>Software Update or by plugging their device into iTunes. If you’re already using iOS 5.1.1, then you won’t be seeing this update as it’s a replacement of the old build, not an upgrade.

You can download the new firmware directly here.