Endless Paradigm

i was just wondering how to change the part where it says "3.40 OE" or what ever other firmware your on, to say something else. because in version 1.6, 1.7, 1.8 i can't figure out how to change the 3.40 OE, to my current firmware 3.52 m33-4?

connect the psp to the PC
run  PSP Content Manager v1.8
RIGHT click to open the menu
pick Custom Firmware Setting(I)
and put in the tap info

thanks