Drive Key Extraction on CFW 3.55

I have a Slim PS3 with CFW 3.55 and since all of the new things have hit about Lv0 keys and ODD Emulators. I was wondering how do I get my bd drive key so I can update to Rogero CFW 4.21 v1.09 and still be able to possibly get the 3k3y?

Thanks