Can't return to stock ROM

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http://forum.xda-developers.com – I unlocked my bootloader from htcdev , flashed TWRP recovery , made a nandroid backup of stock rom , flashed su . while I wanted to flash custom I came to know that i have to flash 4ext recovery and enable smartflash (as i am s-on). I successfully flashed custom rom . Now i wanted to return to stock rom(which is updated to ICS ) . But when i restored the stock rom it struck at htc logo. I tried both recoveries but both struck at htc logo. Help me to return to stock rom. Sent from my Wildfire S A510e using xda app-developers app (HowTos)