Basically, I changed those according to the esmodule of neek2o (main.c) and I don't
know why I can run the game disc w/o problem.(except no region free)
See the video below.
The custom IOS I installed are cIOS249,250(d2xv10 beta52) as well as IOS80.
(base on damysteryman's thread http://gbatemp.net/threads/patched-ios80-installer-for-vwii-allows-sd-menu-custom-channels.344882/)
I can also have neek2o(mod) works for the game disc but I have to insert the disc
before loading neek2o.
Is your patched IOS80 in real vWii or only in Sneek or in both ? I don't have a patched IOS80, maybe this is the problem about black screen...