Hello avic fans. I want to ask if anyone knows which files are Avic f900bt menu language? Standard languages has f900bt ''20 languages supported: Croatian, Czech, Danish, Dutch, English, Finnish, Flemish, French, German, Greek, Hungarian, Italian, Norwegian, Polish, Portuguese, Romanian, Russian, Spanish, Swedish and Turkish.'' but no Bulgarian language. Is it possible translation in Bulgarian, Russian language to exchange with Bulgarian language. for this I wonder if anyone knows what the language files, and whether this is possible? Is it possible to add and Voice Guidance Languages?