Best downgrade for my buck? suggestions? tips?

So I tried to read as much as i could before posting. It seems i can downgrade my model ps3, ceche01 80 gb software BC if i understood the chart correctly? Please correct me if im wrong

Second, i believe this model is the 256 nand memory ps3. Does this require any extra modifications (soldering, etc)?

Also I am not necessarily looking for dual boot capability but the cheapest and safest/failproof option for downgrading(e3, progskeet)?

I actually am trying to take my old legit console that crapped out on me for the most part (cant connect to internet, bad blutooth syncing) and retrieve copy protected saves off of that console. Before you ask, yes i have tried every possible method of backup known to man for the ps3.

Then...buy another old used phat boy downgrade that.....move my copy protected saves over to the new jb ps3 after modifying the save files a bit to make em work hopefully. Then upgrade that new old phat boy to 4.11 connect to psn and upload my saves to the cloud....

I know crazy workaround for all this but its like 2 years worth tiger woods progress.

since you have NAND it will be a bit more costly *if you prefer it to be solder less* i think without dual NAND its 130 $ (progskeet, PCB addon, 360clip, injectus). this is still not a complete solder less method i think you have to configure the progskeet to 3.3v and connect 2 cables from the progskeet to the pcb addon *3.3v and ground i believe*. if you can solder get the progskeet only and find a diagram online for your ps3. OR you can find someone who does a downgrade service *most people do it for 50-65 bucks or more*