use bushing semi-brick iso method to update to 3.2V2 :
http://hackmii.com/2008/05/semi-brick-fix-discs/
it's already injected on an iso, no internet connection needed.
pick the iso from your region.
edit : seems the link are not working. sorry, I'm looking again.
other method is using WUM.
1) run WUM and load a PAL iso, then click "read info".
2) on the bottom there is a "update to download", select 3.2E_B (Bushing), and download it.
3) once finished, select it on the middle of WUM "Replace update", and clic "Replace"
4) close WUM and run it again to verify the iso, load it and clic "read infos" then "Analyze risk". if the patch went ok, it will show you the 3.2E_B infos and says it safe.
5) burn the iso and update your wii with it.