Anyone have success in downgrading back to 3.1.3 from 4.0?

[z400central]

Thinking of putting 4.0 on my 3GS but I'm also selling my phone next week (Jailbroken 3.1.3) - so want to make sure I can revert back to the old OS.

Thanks!

 

[dhlizard]

Thinking of putting 4.0 on my 3GS but I'm also selling my phone next week (Jailbroken 3.1.3) - so want to make sure I can revert back to the old OS.

Thanks!

Why if you plan to restore next week. Plus 4.0 will update the baseband which doesn't revert or downgrade.

 

[Martinsalas310]

downgrade by putting iphone into recovery mode and pressing alt+click and clicking 3.1.3 then when u get error 1015 just use a program called recboot to kick ur phone off recovery mode and voila u have 3.1.3 i just did it 2 days ago i ddnt like 4.0