Edit: The final and non beta Android 5.0 X98 Air II ROM is now out, download it here: http://techtablets.com/2015/08/teclast-x98-air-3g-air-ii-android-5-0-lollipop-official-rom-release/
Teclast have recently released an updated beta Android 5.0 rom for the Air II. I’ve added the download and you flash it like the other official roms via the Intel MFG Tool.
Download below:
[wpfilebase tag=list id=58 pagenav=1 /]
Source: Teclast Forum