Follow the instructions here...
http://www.dcemu.co.uk/vbulletin/showthread.php?t=27829
Basically you need to transfer an element from the e.boot files listed in the above thread using PSPbrew onto your memory stick, and then use the Devhook installer to intergrate the firmware with the Devhook program. You won't be able to use Devhook to launch UMDs until you've completed these steps. You'll need to complete these steps or Devhook won't have the firmware necessary to run it's emulation.
If it gets too confusing PM me - I'll do my best to help you.
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