Finally, some notes on getting the title to run on PS3 Custom Firmware are below, as follows:
The patch was designed for the EUR version of the game. Use the param.sfo to change the USA version before installing the patch.
Change the PARAM.sfo of LA Noire to BLES00933 instead of that orginal BLUS.
Change the PARAM.sfo of LA Noire required fw to 3.55 (or let MM do it).
Save the file.
Overwrite the original param.sfo with the one provided.
Install the pkg update patch.
Run LA Noire on multiman! Then play the game.
Tested on 3.55 Kmeaw's from internal, the game can be started discless.
Note: If your PS3 controller isn't working after you get to play, exit game and run it without sel+x on multiman. Select+x is only needed for it to install. Now your controller should work.