The update is available through Software Update in the iOS Settings application. People familiar with the software said it is identified as build "10B5117b." It arrives three weeks after the second beta was issued.
One person testing the software shared with AppleInsider that users are now asked to enter security questions for iCloud once their device boots up. This feature was not in previous betas of iOS 6.1.
The iOS 6.1 beta is compatible with the fourth-, third- and second-generation iPad, iPad mini, iPhone 5, iPhone 4S, iPhone 4, iPhone 3GS, and the fifth- and fourth-generation iPod touch. Apple informed developers that the beta "contains bug fixes and improvements."
Earlier betas of iOS 6.1 added the ability to purchase movie tickets through Fandango with Siri.
The first two betas of iOS 6.1 also featured an enhanced Map Kit framework that will allow developers to search for map-based addresses in points of interest. In one example provided to developers, users could search the term "coffee," and the system would return the location of local coffee bars along with information about each one.