Can anyone help me?

[Vega]

Wiimmfi doesn't allow ocarina cheat codes at all, unless you have used his tools to patch it directly into the main.dol of your ISO.

You sure about this? Even though it's been a month or so since I've connected to Wiimmfi. I had no issues using normal cheats via SD GCT on an ISO.

@Hari try following the guide that Cameron posted. Start off with a clean ISO.