How do install gitbuilds on my galaxy s3?

[hmwpsp]

device: samsung galaxy s3 by andriod

Every time i try to install one it says there already another "package with a different name and different signature already installed. "

i think i have the latest build(8.1-2 g0c ...etc) but the performanece thread says andriod users should stick to the 8.1-1090 gf ...etc

[Gurlok]

If the older build doesn't overwrite the newer one, you should unistall the latter and then install the old build. Make a backup of your memstick folder to not lose any savefile game.

[marsillpost]

It is already stated on the FAQ that PSX eboot support will never happen, use a psx emu for that, there are plenty of them on the web (epsxe, fpse and so on).
Since English is not my first language sorry for some misspelling on my posts