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i Know there has been tuts on this before. But i would like to clear this up for the unexperienced modders 
1. Download a custom eboot for your firmware
2.Either ftp or drag it into your root of your usb like this:
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3.Click on devhdd0
4.Click on games
5.Then find your region My region is blus31011
6.Then click on the folder USDIR
7.Drag your eboot into it and click replace
link to dex multiplayer eboot:
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link to cex multiplayer eboot:
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i Hope this helped
I DO NOT TAKE CREDIT FOR THESE EBOOTS