hey i am new to xbox 360 so sorry!! i am having a problem. When i dump nand it freezes (not more than 1 sec) and then continues it happens 7 to 8 times in whole process the nand is of 48mb. and when i open it with xebuild it gives and error "Cant determine if it is a big or small block nand" i ignored that message and entered cpu key then i says "unable to decrypt kv either it is corrupt or the cpu key you supplied is incorrect" i checked the cpu key many times it is correct i cannot acces my kv what should i do i also used j runner but there was no problem in it but i wanted to check my kv if it is banned or not,i used kv checker it skipped the kv.bin file i posted the serial no of xbox in xbox console check website it says "unable to detect the state of this serial number at this time, connect this device to xbox live" what should i do MY CONSOLE IS A CORONA 4GB RHG SLIM MODEL