possible to downgrade iphone 4.0 to 3.1.3?

Hi i upgraded the firmware from 3.1.3 to 4.0, a mistake i guess but was wondering if i could go back to 3.1.3 as i want to jailbreak my iphone again

alsi if so is it a hard task?



Did you save your SHSH first?
If you did then you can downgrade. If not, then no.

jailbreak for os4 will be here soon.... it can currently be unlocked but the jailbreak needs attached too

aprrently you can restore a 3g to 3.1.3 fine but will come up with the please restore but according to the sites ive looked at theres a program which will kick it out of recovermode once 3.1.3 is installed and will work all fine :D.

check here for more info.


If you have the 3GS version there is a guide here
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