3GS password locked. How to restore to 3.1.3

3GS password locked. How to restore to 3.1.3
upgrade with custom
if ol3GS password locked. How to restore to 3.1.3
upgrade with custom
if old bootrom
or
use passcode remover

or
http://www.megaupload.com/?d=GWMLR9O0

So there is no chance to restore to 3.1.3 because it has a new iBoot-359.3.2.
I will restore to 4.0.1 and will save SHSH just in case.

or
you can use the advice in this blog
http://www.4shared.com/file/S5T2heY-/blackra1n