Iphone 3g not starting stuck on apple logo

My iphone 3g is not starting simplay showing apple logo it was jailbroken 4.1.1 BB 6.15.00 yesterday i updated the cydia after update i installed fff facebook from cydia during installation ultrasn0w,mobile substrate & substrate safe mode was removed from cydia i tried many times to install these through cydia but wastage of time after that i downloded ultrasn0w 0.9.3 on my pc and coppied the three *.deb files to cydia/autoinstall folder using iFunbox through pc after that i restrated the iphone during restart it stuck on the apple logo please help me