WSR comes with 3.4 so will want to update through disc channel. If you have downgraded from 4.0/4.1 at any time and have not installed IOS50 v4889 then you will brick when you run the update.
If you have naturally reached 3.2 then running the retail disc update will bring you to 3.4 and provide you with some new IOS which will help with other games. 3.4 did not remove homebrew or cIOS, it simply closed the door on the Trucha bug.
Preloader will not work with 3.4 and neither will starfall.