After the release of Apple's previous test firmware three weeks ago, iOS 7 beta 4 download is now out!

Finally, after fixing the issues brought about by a security threat last July 18, the iOS 7 beta 4 download link is now live for the developers. iOS 7 beta 4 download can be accessed directly via an iPhone or iPad running the beta 3 or it can also be loaded via Mac. However, even if the iOS 7 beta 4 download is already out, Apple's developer site still shows error messages from time to time, as reported by Slash Gear.

Release notes for the iOS 7 beta 4 download have not been released by Apple yet. But users who have installed the latest test version of the iOS test firmware can expect its full change log in the coming hours.

But most likely, the iOS 7 beta 4 download will render performance enhancements as well as general tweaks. A full changelog of the new additions and modifications in iOS 7 beta 4 is likely to be fleshed out over the coming hours, as developers get to grips with the software.

But some of the first changes noticed from iOS 7 beta 4 download include modifications to the lockscreen particularly with its 'slide-to-unlock' control. Furthermore, there were also changes on the ability to swipe between panels for the Notification Center. Also, an enhancement was made to place all music tracks on shuffle.

Features for the Mail has also received some improvements on the iOS 7 beta 4 download. Mails can now be deleted faster as "swiping to erase them has been made to a new animation that gets rid of slight lag," as posted by Christian Post.

The iOS 7 beta 4 download also provides new icons for AirPlay.

Safari also got some improvements and additional buttons such as for Bookmarks and Shared links. Furthermore, the reading list is now using redesigned icons instead of labels.