How to mod Portal 2 (noclip, god mode, portals anywhere) JTAG TUT but can be done with iso
1. Go to your extracted portal iso folder and open the folder "portal2", then open the file zip1.360.zip in HxD (or similar hex editor).
2. Go to the "Search" Tab, then "Replace...". set the "Datatype" to "Hex-values" and select "All" in search direction.
3. In the "Search for" box, input everything in the quotation marks: "75 6E 62 69 6E 64 20 22 42 41 43 4B 22 20 2F 2F 22 2B 6D 6F 75 73 65 5F 6D 65 6E 75 5F 74 61 75 6E 74 22 09 09 09" then, in the "Replace with" box, input everything in these quotation marks: "62 69 6E 64 20 22 42 41 43 4B 22 20 22 73 76 5F 63 68 65 61 74 73 20 31 3B 67 6F 64 20 31 3B 6E 6F 63 6C 69 70 22"
4. Click "Replace All" and wait for it to tell you that it replaced 16 instances of it. then open the Search>Replace box again.
5. Set Datatype to Hex-values and Search direction to All again.
6. In the Search for box, put "2B 72 65 6D 6F 74 65 5F 76 69 65 77 22 09 09 09 09 09 2F 2F 20 28 59 29 20 42 75 74 74 6F 6E 0D 0A" and in the Replace with box, put "73 76 5F 70 6F 72 74 61 6C 5F 70 6C 61 63 65 6D 65 6E 74 5F 6E 65 76 65 72 5F 66 61 69 6C 20 31 22" and click replace all.
7. Wait for it to tell you that it replaced 17 instances of it. When its done, save the file and plug your harddrive back into your jtag. Load up Portal 2.
8. If you press the Back button, it will activate or deactivate noclip as well as turn on god mode (you cant turn it off). If you press the (Y) button, you will be able to put portals on any surfaces (cant turn this off).
9. What are you still reading for? enjoy.
Post Script:
Achievements work with the mods on
EDIT: premade file for download if you want to do that instead. Just download and unrar it, then stick it into the folder "portal2" in the game folder and overwrite the old one.