first get zip0_xbox.xzp from your xbox, it should be in Z:\hl2\hl2x \
inject your config, then put it back on the xbox \
also delete xboxuser.cfg in E:\TDATA\some number\hl2\hl2x\cfg \
and put the_config.cfg in E:\TDATA\some number\hl2\hl2x\cfg \
the game will write another xboxuser.cfg which is now the config you injected \ 
but sometimes it deletes things so thats why you need it to exec another config