I am interpreting your post that your friend has a Japanese market Model 3 in Malaysia. If that’s the case you should know that Tesla build their cars for the specific market and don’t assist with moving them to different markets in most cases.
I do know that Hong Kong located TMC member
@electricboat can help with changing maps and perhaps with the radio frequency too.
I would connect via WiFi to a suitable phone and use TuneIn to play your desired radio stations As the Tesla AM FM tuners are not the best IMHO.