I have a CECHA01 PS3, manufacturer in Feb 2007. At one point it did have CFW 3.55 installed but I've since then updated to OFW 4.31.
I was going to attempt it myself but no guide is clear enough for me to attempt the process.
Only concerns I have is I want a solder less method. I don't want to solder anything to my PS3. And unclear exactly if I need an infectus or not. I know I need the Progskeet for sure. I don't mind soldering the progskeet to the infectus.
That's basically my only questions... if I get a Progskeet 1.2 for NAND flashing, will I have to solder anything to my PS3 board and do I need anything else.