Hi Paulo, link for multi V6W 3.12.13 :
http://www.ulozto.net/xYv71vqP/miuiandroid-multi-v6w-3-12-13-jb-4-2-zip
and yes, you can install Stable 4.0 version ;)
Attention - Eng WCDMA Touch version CWM 6 from first post erase IMEI and modem version!!! (user Jeremi - http://xiaomi.eu/community/threads/red-rice-imei-sim-problem.22726/page-2#post-189748 , or on Czech/Slovak MIUI phorum : http://www.miui.cz/index.php/topic,1019.msg28422.html#msg28422 )
Be...