Please help, was flashing sgh-i747 with new security

*need help with SGH-i747 with new security, I was downgrading android so I could unlock when I got to the end of flashin phone shut off and now doesn't want to turn on**and I see NO support of SGH-I747, But Riff box supports PLEASE HELP. THANKS

via Welcome to gsm-tips http://forum.gsmhosting.com/vbb/f684/please-help-flashing-sgh-i747-new-security-1748834/