latest rom 15s 16s and 17s here :
http://www.letv.re/topic/1506-all-roms-lightfwserie-formax900-multilang/
INSTALL :
1)made full backup with TWRP
2) boot in to TWRP and wipe cache dalvik (better full wipe)
3) flash Light custom Rom Fw 11s mutlilang for X900
4)when flash done reboot your phone (long press power button)
5) when phone fully booted, launch TWRP recovery again and apply Update.Light.Rom.v1.1.oFw:11S.By.Spzjulien.zip and Reboot (no wipe before or after … for the update !!)
Light custom Rom Fw 11s mutlilang for X900 :
deodexed
rooted with superSU 2.67
busybox
Update.Light.Rom.v1.1.oFw:11S.By.Spzjulien :
better multilangue Thanks to french team 
deleting some chinese apps (more cleaning next update)
installing Gapps, Google keyboard,
Installing OTA updater for easy next update deployement