PSP chickHEN on a 3.90 consoul

Im in a bit of bother.
Is it possible to run the new chickHEN psp TIFF exploit on a 3.90 offical firmware psp?
If i try to upgrade it will go streght to 5.51 which doesnt work with the Homebrew enabler. so will it work on a 3.90 consoul?
thanks in advance

It seems like you got custom firmware, according to your sig running 1.50 kernel.This will get you from 3.90 CFW to 5.00 M33-6
http://forums.exophase.com/showthread.php?t=9447