'Downgrade' to 3.1.3 from iOS4

[Tidefan73]

Hi all. As you can see, I'm new around here, but have lurking for a while...learned a lot while doing it!!

I know this has probably been asked a million times, but I can't seem to find the answer...

If I upgrade to iOS4, is it possible to downgrade back to 3.1.3 should I not like it or if I want to JB it?

Thanks!!
T-

 

[BuddhistGirafe]

Possibly. The way I did it during the Betas was to restore it, it would fail half way, then run blackra1n, which would do something to get stock 3.1.3 on it. Then reboot and I was at 3.1.3. So ya. Try that if you want.