#4 "Hidden content" is literally just a link to the public GitHub page of CFW2OFW Helper. When the post was made it was on version 6, though I imagine version 13(or whatever comes out in the future) is fine as well. The other piece of #4 is "TrueAncestor_BACKUP_Retailer_v2.20" on mediafire. #5 is just a link to a folder of PS3 torrents on a now-dead torrent site(so it wouldn't do you any good).
this is prob just another trick like most i'd advise being carful when installing anything into your console's if you break the firmware you can make it into a brick ofc if your decent at tech you can unbrick any of them just takes alil work.
thanks for posting this...still valid and an awesome resource for people looking to get a little more life out of our old ps3's