* In English: "Hello!" is perfectly fine.
* In French: "Bonjour!" is the common greeting.
* In Cameroonian Pidgin English: "How you dey?" is a very common and friendly greeting.
* In other local languages: Cameroon has over 200 languages spoken. If you know the specific language you want to use, you can find a greeting online or ask a native speaker.
It's also good to consider the context. "Bonjour" might be more formal than "How you dey?" and a simple "Hello" can be used in most situations.