Minix just released a new firmware/rom (beta though) for the Minix Neo X5 Android Box which was shipped with Android 4.0 (Ice Cream Sandwic) Now it’s possible to upgrade to Android 4.1.1. (Jelly Bean).
MINIX announced on their facebook page:
4.1.1+1080p firmware for NEO X5 available here: http://www.sendspace.com/file/cisp01 you may download it first and wait for our instruction about how to flash it! DON’T do it without our tutorial.