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To install the custom firmware it is actually really basic. Follow bellow:

1- Download Geohot Firmware from his website. [HERE]

2- Now, open the .zip you just download it. You will notice there is just 1 file called 'PS3UPDAT.PUP'.

3- Plug in your pen-drive and copy the .PUP file into: PENDRIVE > PS3 > UPDATE >.

4- Turn on your PS3, plug in your USB and go to system update . Update from Storage Device. Update like normal.

You will need:
First, before we start download the following:
- File Manager [HERE]
- Any patch you would like.

1- Install File Manager into the PS3 by placing the .pig file you downloaded into your pen drive. Than on the PS3 go to 'Install Package'.

2- Get your patch, and place it inside your USB.*

3- Plug your USB into your PS3.

4- Go into 'dev_usb000' to make sure Patch_mp.ff is there.

5- Now, press the RIGHT D-PAD, and go into 'dev_hdd0'

6- Than 'game', and than choose your game. (To know your*
game ID, look in the CD. It should say it in there.)

7- Press LEFT D-PAD, and click R2 on top of your Patch (Inside the USB). It should ask you if you want to move, and click yes.

- PS3 FTP Server [HERE]
- FileZilla [HERE]

1- Download the FTP Server above. Open the .rar using WinRAR or any other .RAR viewer.

2- Extract ONLY the .pkg file. Place this .pkg into your Pen Drive root. (Root is the first folder when opening the flash drive.)

3- Plug your USB into your PS3 and go to 'Install Package', and install the .pkg you just placed in your pen drive.

4- Now start the FTP server on your PS3. (After you start, do not press any thing!)*

5- Open up FileZilla on your computer and put the following:
Host: (IP that shows on PS3 FTP)
Username:FTPD12345
Password: (BLANK)
Port: 21

6- FileZilla should have load up, and you should see some new folders on it. Go to 'dev_hdd0' than 'game' than find Mw2 or what ever game your going to mod. (The numbers you see, is game ID. Look it up online for your game.

7- Drag your patch into the folder where the original file is at.

8- Quit FTP on PS3 and start game. You will be done.