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I am using 3gs, its currently running on ios 4.2.1 and its an jailbreak device (via redsn0w)...
I am using ultrasn0w to use other carrier and i don't have original sim card.
I want to update it to last version of ios which is supported by my device i.e ios 6.1.5
I tried a lot but failed to update.. i use iTunes and original firmware to update my device, even i tried for ios 4.3.4 but failed.
plz help me guyz........................to make update
i wan't untethered jailbreak.........
my device details:
Serial No.: QR1300XXXXX
Operating System: Windows XP S-2
iTunes version: 126.96.36.199