Welcome to PSP-Spot bigcee1.
DevHook isn't the best program to use at the moment, Dark_AleX's 3.03 OE-B custom firmware allows you to run ISOs easier; as well as many other features.
I wrote the outline of steps required to get from any firmware below 2.80 to 3.03 OE here:
http://www.psp-spot.com/forums/index.php?s...st&p=208480It involves upgrading to 2.80, running HEN for 2.80, downgrading to 1.50, then installing 3.03 OE.