To get ur gta umd workin download the mph game loader get the flash files u need, open mph game loader and load it.
to get ur madden workin load up daxziso loader make sure it 0.55 load madden using run umd load exec or direct load exec, if that doesnt work try using the set version changior to chan ge ur psp's version to 2.0 and then try loading direct load exec or copy load in daxziso loaader

AND NO U CAN DOWNGRADE 1.5 TO 1.0

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