Rev 8 of what? Is that cIOS 36 rev 8? There are later ones available, all the way up to cIOS 38 rev 13b, rev 14 apparently is due soon.
Try Usb Loader GX which will allow you to run all games, even those with 002 errors. Your backup launcher may already have workarounds for these errors.
There are loads of Green Screen error posts here on Wiihacks, look into them. I've never had a green screen error so never needed top find that one out.
ok just tried installing Usb Loader GX and it gave me error ret 1022. not having alot of luck..lol