isos need 2.81

i have devhook installed on my psp 2.71 with the special motherboard the one were you cant downgrade. i have two isos which when they start up they say they need 2.81 and 2.82 how do i go about getting these to work

any help will do thanks

sorry if this has been posted before

hi thank you done all that now i am running 3.03 0e-c so do i just use devhook that i all ready have or do i need to download a new loader

do i have to use hen c aswell with devhook like i did before