Upated my wiz.
1. uncompress all files to root of your SD
2. insert your SD and turn on your Wiz
3. push B button when the upgrade popup appears (just follow on screen instructions)
4. Wiz reboots in Wiz menu
Now when you turn off your wiz and turn it back on, i got the scrambled/rotated wiz logo, so i did the following steps
5. Turn off you Wiz
6. Hold R and turn on Wiz
7. Release R when a pop-up windows appears about the update, no txt on it (no info on pressing buttons)
8. Waited, and wiz booted back into wiz menu
9. Rebooted wiz and updated agian the normal way (step 3 and 4)
Now my wiz boots normal, without scrambled/rotated wiz logo screen
Dunno if all steps are needed, but it worked for me this way