No, there isn't any MAIN. M-Tel is not Vodafone.
But, if you want vodafone firmware containing bulgarian language, you can make a "customize_upgrade.xml" and flash, using the CDA number 1208-8829, following this tutorial:
http://www.topsony.com/forum/a2uploa...tml#post107964 . You'll get the latest vodafone firmware for your zone and you won't need any MAIN.