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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 jailbreakme.com. is it possible? and can it be unlocked? thanks

asked 09 Feb '11, 04:16

cholokoy15's gravatar image

cholokoy15
16518


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

link

answered 09 Feb '11, 04:19

crazechoice's gravatar image

crazechoice
3112

i have saved my ios 4.0.1 using the tinyumbrella..

(09 Feb '11, 04:26) cholokoy15 cholokoy15's gravatar image
1

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 jailbreakmatrix.com 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.

link

answered 09 Feb '11, 04:28

justinb51's gravatar image

justinb51
463

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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