A few questions about jailbreaking a PS3

[Darkbred Chaos]

I was poking around, and found a method to jailbreak that seems within my means of doing. This method here:

http://www.epforums.org/showthread.p...ager-7.8-Guide

A few things come to mind when reading through the process of this. One, is there someway I can reverse my console being bricked? Is there some sort of recovery utility built in, or some way I could flash legitimate firmware to a bricked console?

Secondly, one of the links posted in that thread that points to the download of the CFW, has a list of serial numbers and the corresponding NANDs. It's stated to not work on 256MB NANDs, which I don't have. I have 16MB NAND Slim. I'd like to double check and make sure that's okay. I'm trying to be weary, as I'd really like to avoid bricking my console.

Thanks.

EDIT: The link I was referring to was actually a link on one of the linked pages, figured I'd add that in.
http://www.ps3-hacks.com/2011/01/17/...ackup-support/

EDIT2: After doing more poking around, it seems it works on nearly all Slim PS3s, given proper installation, which brings up a new issue. After reading a large chunk of the comments on the latter of the two links above, it seems some people have a different CFW, Geohot's I believe, installed before putting the 3.55 OFW on, and it works great. Could someone with some knowledge of this let me know if it is required to have Geohot's CFW first?