(adsbygoogle = window.adsbygoogle || []).push({}); Hello NGU

So im getting a 3.55 ofw ps3 and I want to get on the latest DEX firmware (ps3ita 4.50) where do I start to get it to DEX ps3ita 4.50? I've read alot of tutorials but I cant find one how to go from 3.55 ofw to dex.

Thanks in advance!