NOO , not just notepad, bro You need special software: param-SFO-Editor This is also included in the ps3tools collection from aldostools. (at aldostools.org/ps3tools.zip - this is a great collection of ps3 tools. RESPECT for this awesomeness)
And with that editor you can just select the fw-ver from a drop-down-menu
Blade, Well when I finally figured out to use ps3 tools to extract the original patch, then it was good from there. I had to use the files from kalaner because I'm guessing the ones I DLed were bad.
kalaner I pretty much followed Blade's instructions step by step. The only difference with me is that after deleting the game data, I installed the the zombiekillah v103 patch. Here's the way I did it:
PS3: Delete all game-data from mw3
PS3: installed mw3 patch v103 (zombiekillah)
PS3: I installed the fix-bundle of 1.19-1.20-1.21 (100MB) [the ones you supplied worked]
PC: then I downloaded the originalpatches 1.22 and 1.23 for MY version: bles01431 (you do yours ofc) [still used yours]
PC: Extracted both, copied 1.23 over 1.22 (overwrite all files). [used ps3 tools]
PC: Extract the new nodrm 1.23 fix and copy &replace to the folder from above (EXCEPT PARAM.SFO) [only 3 files]
PC: Edit the PARAM.SFO (which would be the one from 1.23-original) to set FW-ver to 3.40 ->save/replace [i did 3.40 and worked fine for me]
Then copy all files over to your ps3 to dev_hdd0/game/BLES01431 (you do your ID ofc)
PS3: Mount game & play (for online FckPSN is needed ofc)
Just a heads up. It didn't work the first time I did it. I'm guessing it was because the patches I grabbed were perhaps bad? But I'm happy to say that I'm fully online and just finished my first spec ops survival match!