So im just now getting back into the hacking scene and need a bit of help, well more like correct information. This guide states that you cannot downgrade 4.xx with software but I've ran across more recent posts on other sites saying that you can. These other sites are inferior to ps3hax so I wanted to verify this before attempting.
One of the many other sites with this theory:
http://ps3jbhax.wordpress.com/tag/4-30-downgrade/
Thanks.