The original file is a generic (but hard to work with) loader, that can load code using GTA.

It was originally released with a "Hello World" program, that it could run.

Following on from that, I helped the psp3d Admin port one of my old Tetris games, so that it could also be run from GTA (although, only on v2.01 FW).

Before the Hello World, I ported a downgrader to use the same loader, but it does not work - the GTA environment does not provide access to the PSP's flash, so downgrading using currently-known methods is not possible.

I'm working on porting the EBOOT loader to this environment (so that 2.01/2.5, and later 2.6) users can use it, stay tuned for future news on that.