How to set the ringtone of BlackBerry 8700g SMS?

BB has a shortcut key on the left. Press it and the scene configuration settings will pop up. Press the wheel to the bottom and select Advanced. Press the wheel loudly to edit SMS or SMS ringtone. Needless to say the rest. If you choose the ROM of MP3 ringtone 4.5 uploaded by yourself, you can use it directly, but not if it is a ROM of 4.2. You must first change the system language to English, and then change your ringtone back to Chinese according to the previous steps.

I don't know where to change the language. If you choose "Options" on the desktop or support desktop shortcut keys, press "O" (non-zero) on the desktop, select the language, and save the first item in English.