Thnx ppl for clearing up that part.Other thing is that I use Jtag tool by cool shrimp to RGH my xbox,so i ve created the ecc file and wrote it to the xbox but its not boot up to the Xellreloded Screen and the green power light keeps blinking(hav set cooleruner to normal mod & used eject button to powering up the console) .i use coolrunner rev b and all my soldering are fine. even after removing all the soldering it wont boot to normal dashboard so i decided to write back its original nand back but after writhing when i try to boot i got 3 red light blinking.