I haven't been checking on PS3 hack news lately, but today decided to check and WTF?! Rogero CEX 4.21 and Blue Disk 4.25 crack free. This is very nice because finally we can go online but another PSN update Tuesday

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Thing is I don't know much about PS3 hack stuff, I just followed directions from the net and got my PS3 to 3.55 and started playing games. My PS3 currently is 4.21 DEX. I wanted to know which should I install, Rogero CEX 4.21 or Blue Disk? I sort of know the Rogero CEX 4.21 but don't know anything about Blue Disk.
If possible could someone explain to me what Blue Disk is. Also what is that LV1 and LV0 key on the news? Which CFW should I install? Thanks.