Question [Q] cant flash firmwares

hi. ive got problem with my OB. the problem is that i cant flash most of firmwares using smartflash tool. some time ago i could flash every firmware but now i can flash only v20 branded to 1&1 which i cant root or polish v30b. ive tried flashing cwm for v30b, it worked and ive installed custom rom, but after reboot ive had bootloop. every other flashed firmware causing bootloop. any solution?