If you are having a problem with SongKong on a Melco we may create a test version for you to aid in diagnosis, this will be a later version and installation is explained here
But these are only intended as temporary versions so how do you go back to the production version ?
Simply, ensure songkong.test file has been removed and then use Check for Version on the Melco OLED as usual. SongKong will find the latest production version and as long as the version number is different to the test version will allow you to install it, replacing the test version.