I assume that you are running this on a 1.5 fw unit

Have you installed ALL the files that come with Devhook ie the Flash 0 & 1 files ?

Have you altered the FW selection in the menu to one you never installed ??

Also have you saved your backup copy of the iso in .cso format ??

Other than these there isn't much to get wrong so if none of these work try d/l an install programme by a "chaos zero" chap over at PSP Hacks.com as everything you need is there and has been updated for version 0.45 - this is one i used and am running 2.71 on my 1.5 !!

Good Luck

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