Downgrading back to 3.0...

[tibby05]

I have 3.1 installed and I would like to go back to 3.0 to enable tethering. How would one do this?

 

[Tokiopop]

Depends what device you have.

Normally you would just hold option (shift for Windows) and click Restore than choose a 3.0 firmware.

 

[tibby05]

I have a 3Gs, and what if I did not ever update to 3.0. I might not have the ipsw file because I bought the 3Gs with 3.1 installed on it. Any idea of where to get the 3.0 ipsw file unless someone can upload. But I think its a very big file?