The users of HTC One X are luckier than the users of Samsung Galaxy III; you all need to thank the leaks by which the latest Android 4.1 Jellybean is possible to install on your HTC device. You all need to keep in mind that this is being extracted from the SDK (Software development Kit), whereas this is not officially released by Google Inc or HTC.
You need to have a network unlocked boot loader device which should have a boot access to apply this firmware. From the Google play store you can download the Root Checker app, to check that the device is rooted or not. You need to root the same if your device is not rooted. All the fundamentals will not work because this firmware is a beta port, but in the future all are added to it.
The official update of Jellybean 4.1 is confirmed by HTC, but for which the same there is no ETA given.
Disclaimer: For any damage that may occur to your phone while applying the rooting process, we should not be blamed. If you follow the instructions that are pointed in the procedure there are very less chances for the damage to your device.