Try this for an easy option enter recovery mode and specify "Game" as 1.50 kernel folder then delete all game folders (game,game150 and game303 Plus all content within) then create to empty folders named GAME and GAME303.
in the current config GAME is the 1.50 homebrew and PS1 Emulator and GAME303 is 3.03 kernel, so put the OEB_Update folder straight in to the GAME folder so you have \psp\game\oeb_update\eboot.pbp and it should work good luck
