no you don't brick it. that's stupid !!
you run minvercheck as an update in the xmb
if your console will go to or below 3.55 then you need a flasher
if slim then you can use a progskeet or E3 flasher or TEENSY++
if you have a phat that is CECHG or below (the 5th letter between A-G) then you have a nand console so use progskeet or TEENSY++
if you have a phat CECHH or above then you can use a progskeet or E3 flasher or TEENSY++
you make a dump
validate it
patch it for 3.55 (or the latest cfw eg 4.53cfw)
flash it back
install rogero3.55 in fsm (or if you patched for the latest cfw then install the cfw in recovery menu)
qa dehash (skip if you patched for the latest cfw)
install any cfw / ofw you want
if your console is 3.56 min then patch for the latest cfw ONLY in the patch step above