For anyone still needing help with unlocking just use this tool.
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Just run the .exe and set it up like this example, make sure to replace the Dir with your folder that has the game. Then you just press Replace and it will search all the files and unlock all of the songs. If new updates are released you can just run this tool again to unlock them, no need to do it manually 1 by 1 or wait for someone to upload an unlocker. Like this you can be sure you unlocked all of them, I was stuck at 920 before running this now I have 933.