yesterday I was tried to update my iphone 3G Ios vertion3.1.3 to 4.2. but it was not successfull becase always coming that 1015 error massage.I downloaded ios 4.2, 4.2, 3.1.3 and tried to restore using itune but same eoor msg is coming then I tired to restore ios by using tinyumbrela method...

afetr I try to update my iphone 3g ios 3.1.3 to ios 4.2 not its stuck and coming error 1015. I dont no what to please help me to upgrade or downgrade.thanks

is there any methods to upgrade ios 4.2 without itune?