This is a new baseband for MT6589(T) device.
Fully tested on Thl W8 beyond, it include W-CDMA 800/850/900/1900/2100 Mhz.
Work only on baseband MOLY.WR8.W1248........V7.. (V7 is important !).
First, made a backup of the modem.img file.
Copy /system/etc/firmware/modem.img to a safe location.
Download: http://ovh.to/JuVGPVe or here: http://ge.tt/536dU7i (select MT6589_modem_v7_08.05.2013.zip)
Reboot into clockworkmod recovery, and install the zip file.
Alternatively (recommended) you can simply copy the modem.img (from the zip archive) file into /system/etc/firmware/. Set file permission to 644.