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i have iphone 3gs upgraded to 4.2.1. i want to downgrade my firmware to 4.0.1 so i can jailbreak it using is it possible? and can it be unlocked? thanks

asked 09 Feb '11, 04:16

cholokoy15's gravatar image


It is not possible if you do not have the shsh blobs for 4.0.1 backed-up.


answered 09 Feb '11, 04:19

crazechoice's gravatar image


i have saved my ios 4.0.1 using the tinyumbrella..

(09 Feb '11, 04:26) cholokoy15 cholokoy15's gravatar image

1)To begin, make sure you have downloaded the correct ipsw for your device.

2)Start tiny umbrella and press “Start TSS Server”

3)Ppen itunes, hold down shift(windows) or option(mac) then press restore (tiny umbrella only supports restore not update). A windows will open where you can choose the firmware that you want to restore to.

If near the end of the restore process you get error 1004 or 1015 do not panic it is expected. Just use the “kick device out of recovery” button and your device should boot up.

(09 Feb '11, 04:33) crazechoice crazechoice's gravatar image

Check the site they have a very detailed list of what firmware/base band can be jailbroken and unlocked. Keep in mind that you may be able to down grade your firmware but if the base band was up graded it can not be downgraded.


answered 09 Feb '11, 04:28

justinb51's gravatar image


edited 09 Feb '11, 04:29

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Asked: 09 Feb '11, 04:16

Seen: 534 times

Last updated: 09 Feb '11, 04:33

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