ok, you do need pandora's battery, you can install a custom firmware right away with despertar del cementerio
Slim cannot go to 1.50, also 1.50 kernel doesn't work on it, but don't worry, most of the homebrew has been ported to the 3.XX kernel
For homebrew and PS1 games any CFW will do.
The PS1 emulator is built-in the Firmware, was made by sony and unlocked by Dark Alex, beautiful isn't it
The PS1 games need to be converted into ebbots, I use a program called "psx2psp" and there was another one called "Icetea", both are good
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