Build os Black screen failled need major help

[07cosld]

So a friend of mine gave me his 6700 and i decided i was going to upgrade from windows mobile 5.0 and to 6.1 !!! Yippie

I downloaded build os,
Downloaded kitchen,
Cooked,
sent to phone,
Hard reset
PHONE WENT BLACK AND WONT DO ANYTHING WTF?
IT SAYS USB AND SERIAL v1.0

I don't know what the F@#k to do , i have searched here with no avail,,,, Please help , i will owe you my left nut