The download is 367.2MB according to MyBroadband forum members that own the device, and is available as an “over-the-air” update.
According to feedback from MTN the update may not be widely available yet, with the GM of product solutions Mike Fairon saying: “MTN confirms that the update to Android 4.1 for the HTC One X will be available to its customers. The update will be available on the network by end of this week.”
While there are significant improvements in Android 4.1, codenamed “Jelly Bean”, it is not the latest version of Google’s mobile operating system.
Google announced Android 4.2 – which is also called “Jelly Bean” – during November 2012.
Android 4.1 was announced just over four months before that on 27 June 2012.
It typically takes a few months for updates to existing handsets to appear once Google announces a new version of Android.
For example, Samsung Galaxy S3 users in South Africa received their update to Android 4.1 from 20 November 2012.
HOX discussion: HTC One X official MyBroadband forum thread