Easy step by step 2.5/2.6 Downgrade guide.

brilliant, i am in your fan club

i have a question. the guide says: "It is suggested if you have not upgraded before and are a 2.5 user that you first upgrade to 2.60."

i have a 2.50 version psp and never upgraded, what happens if i try to downgrade without upgrading to 2.60 first? :confused:
:-W