First off you will need a (preferably 3.xx) version of the ps3 generator tools, included with the SDK SCE.
First Backup / WAREZ (for extra lulz) your game. If it's signed with 3.60 + then 'make sure the game first has an update for download, if it does not then do not bother continuing.
Second Open ps3gen.exe and click game setup. Then load the game and then fill in sfo's any missing info. Information content in files drag and drop, etc. Put in disc version icon0.png 0:00 to bypass any errors.
Third In directory structure and then just fill the open PS3_GAME USRDIR and tropdir folders with the backed up / warezd game's files.
4th Click on image build and select if you want bd-r or usb hdd. If usb hdd, then first you have to format it via the tool.
5th Build the image.
6th Install the game RETAIL update on the target.
6.1 If your dex can go to a search as fw 1.92 then you can install after downgrading to fw said.
6.2 If you can not do that then downgrade to 3:55 using the special downgrader pup and then install a fw index that has been modified to allow retail pkgs.
3.6 If said game is 3:55 and does not have update and then make one using make_fself_npdrm npdrm make pkg (not egohot, sdk one)
7th Upgrade to highest possible index fw to enjoy hacking the sht out of MW3.
8th If using usb hdd then go to Settings and debug bd drive to set access usb hdd, else leave it at bd-r bd drive if using.
9th Insert selected WAREZ ** ** medium.
10th ?
11th PROFIT. Disclaimer: The steps provided are somewhat inaccurate in terms of button names, etc. Wait for me to come back to my pc on Monday for more detailed steps
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