how to get a specific ending? *spoiler*

[sharien]

hey ppl...i looked through the end movies and wondered how to get the corporate/triad ending where you end up a hero
anyone got this one?
when i got for triad i end up killing imus stepdaughter and then facing the berserker hordes...
i even managed to destroy all berserker fighters and several of the respawning super chimeras...(emerald shields and 3 tungstens+kalem piloting did the trick mainly) but sams manticore seems to have fixed hp as my 2,5k damage major cannons didnt do anything to his shields...
the only other option seems to be to leave the system and this triggers the ending where the "metal avalanche" rolls through a lot of systems(although actually halted by my mothership^^)
so this doesnt seem to be the right path...so which is it then?