You probably need to connect to a PC to overwrite the save file; alternatively, if the save is stored on the official website, you can just log in using your official account.
In this version, I reached the point where the fishing spot opens, but I noticed there were no high-end fishing rods available for purchase. I wanted to delete my save and start a new character, but even after clearing the cache and data, the game still loads my original character's progress upon logging in.