CFW 3.72 HX-1 help

I recently got a PSP and though "the latest custom firmware must be the best, eh?" and upgraded to 3.72 HX-1. Only now I realize that there's no support for the 1.5 kernal so I can't run any homebrew. Does anyone have any ideas on how I could downgrade? I have a pandora's battery, but I have no idea what to put on my memory stick. Thanks in advance!:o

maybe despertar_del_cementerio, universal unbricker
That one will get you to 3.71 M33, and then get 1.5 addon 2

theres is an addon for this CFW to get 1.50