Midway Arcade Treasures Not Working

[keys]

I just tried Midway Arcade Treasures for the PSP. It calls for a firmware update. 2.0 is on the UMD. I tried the WAB and the SXT version changer and neither work. An error message comes up : FFFFFED3.
Anybody suggestions?? I searched and couldn't find anything.

Thanks

[Psphreak]

You don't need the WAB version changer. Load up UMD Emulator .8c, disable any flash emulation, choose option "Direct Load", Boot.bin "ON" and it should go.