You need 2 ps3's 1 on the latest Firmware and on 3.55 CFW a ethier net cable and a brain.
note (You can buy CFW ps3's on ebay & craigslist)
Ok heres what you do.
1.Find a patch you want to use.Open it up in buc shots FF editor.Find the perks and change the name to your psn. hit save GSC.Ok now put that patch_mp.ff on your usb
note(You can also use FTP Black box to transfer the patch)
2.Now your gonna need a file manager i recommend commigine for you.Fine that pkg on here DL it and put it on your usb to.
3.Now turn your 3.55 CFW ps3 on insert the usb.Install commigine.Ok now open up commigine Now do exactly like this
(LEFT SIDE)USB_Hd00>find your Patch_mp.ff and highlight it.
(Right Side)Dev_hd00>game>Blus30377>USIRDR>Patch_mp.ff
4.Now turn on your latest Firm ware ps3.Turn off the internet.Go to data transfer utility click the bottom one.Now do the same on your CFW ps3 but hit the top this time. Now it will transfer the Patch so you can play online.
5.Last step Recover your acc and go have fun.