Stuck on "Iphone is restoring firmware" on an iphone 3g help plz

the phone running ios4.2.1 , put dfu mode, installed custom whitedoor ios , keeps on saying "iphone restoring firmware." tried install ios 4.2.1 , says same thing never moves there. last part of restoring , iphone work it's stuck there. there fix this? plz tell me yes

 

help please!

 

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