Android 4.2.2 Jelly Bean is already ported for almost all high end devices but now it’s time for devices like HTC Desire. Thanks to XDA Senior Member vijendrahs bringing out CM 10.1 JB 4.2.2.
What is working:
Video Recording (Still choppiness, use MX Player with S/W decoder for playing)
Video Playback without any flickering
FM Radio (Use Spirit FM, go to Settings -> Audio -> qsd8250)
All games should work
Before you do anything maybe you should do a backup.