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Is it a .GSC or .SPRX? If .SPRX go into multiman and put your .sprx file into dev_hdd0/tmp. After that put the EBOOT into your games USRDIR file and that's it. If its a GSC ou need GSC studio and connect your ps3 to gsc studio then press inject compiled files then find your gsc men file and open the menu folder, open the maps folder, then select the mp folder and press inject and then press inject on gsc studio and wait until it says Injecting Done. in the lower left corner before you start the private match

I would suggest using a sprx gsc injector because it is easy to install and use but you need a dex ps3 for a sprx menu.
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Moved to the correct section.

for GSC menus u inject it using a GSC injector such as GSC Studio. or u can use the SPRX GSC injector.

or if you want to use a SPRX u drag the eboot of the SPRX into thedev_hdd0/game/(game region)/ USRDIR folder and the SPRX into the Dev_Hdd0/TMP folder on your PS3

Are you still having issues?