there isn't much you can do at this point. Unless you sell that one and find a used one that has the firmware 3.55 or below. Then learning how to jail break w/o exp. can take months to get right. You could break your system trying do so. If you are successful then it could still take months to download a handful of games.
It might have been best if you had a unit when geohot was still around. Now things are so hard to find it could be the end of hacked ps3s for a while.