Oh, I'm assuming Wii cISOes are the same as GC cISOes, modded ISOs that still keep the default filesystem intact.
They're the same format. It isn't actually compressed; it's more of a "sparse" format in that it removes unused blocks (scrubbed).I think the Wii's cISO is different than the Gamecube's cISO format. (makes me remember I need to allow listing of ciso file extension for gamecube games in USBLoaderGX as nintendont can read them).
Already did some hours ago. Thanks for replying thoughJust install a d2x cIOS to slot 249 using the d2x installer. It will fix your problem.