Let me just check the obvious things first...
1. You realise that you can't run UMD Games when you're running 1.5 firmware, right?
2. To run UMDs, you still need to use Devhook. When you select what game you want to run in DH, select "UMD Drive" and start up as you would normally start a game from you MS.
Because Devhook tells the PSP that the game in the UMD drive is something other than what it really is, you can't just throw in a disk when you're running 2.7 and play it. You still have to go through Devhook.
Is this your problem or have I misunderstood?
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