lakewhut: He didn’t. Contrary to popular belief, it was his talmid the Maggid who began to change the Nusach. Your question still stands though. Rav Henkin (who wrote the Ezras Torah luach, I think at the behest of the Chofetz Chaim who should know minhagim) wrote about the halachos of keeping minhagim and changing them and at the end added “except for the chassidim who follow there rebbeim.”
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