Problem updating iphone 3gs to ios 5

Hit the Ok button; Now hold down the shift (Windows) or Alt/Option (Mac) key and click on Restore button.

You don't need to go into any mode just option click restore then select that ipsw.

***Do NOT select the stock i OS IPSW or you’ll lose you unlock*** Once the restore process is complete, your i Phone 4/3GS will have a preserved baseband and now ready for the jailbreak and then unlock with Ultra Sn0w; Now you can unlock your i Phone 4 or i Phone 3GS with Ultra Sn0w or Gevey SIM on i OS 5 firmware; To jailbreak i Phone 4 or i Phone 3GS on i OS after preserving the baseband, Follow this: (how to jailbreak i OS with Red Sn0w) guide from Step 3.

After jailbreak, here’s How to Unlock i Phone 4, 3GS i OS 5 with Ultra Sn0w.

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But at the same time, new software updates promise all kinds of cool new features. So it makes sense that i Phone 3GS users, who aren't ready to upgrade to the i Phone 4S, would want to update their phones with the new software.

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