OK, I've equipped myself some more reading from both psx-scene and ps3hax. I was hoping the PS3 I just got had some FW like 3.55 or lower, but unfortunately after opening the box and turning PS3 on, I found out that my PS3 is on 3.66. It looks like I have the newer SLIM version CECH-3001A which Sony claimed unhackable??? I also read from the sticky that if I am on 3.66, there is no downgrade, no CFW.
As far as I have been reading, for people with >= 3.56, normal procedure is to update to 3.73, then use E3 Flasher or Progskeet os PSJailbreak USB. Unfortunately, my SLIM version is currently not supported by the current E3 Flasher 3K. Not sure about other methods since they do not have the compatible list on the site.
So, for anyone with the similar situation, especially n00b like me, is looking for the same solution, please feel free to jump in, even just to say hello .
For others with much more experience and knowledge, especially for new model CECH-3xxx, please give us some advice. Do we have any hope, or it is simply mission-impossible now?