The Divrei Chaim paskens you can switch from Ashkenaz to Sefard but you cannot switch from Sefard to Ashkenaz.
The Igros Moshe paskens you can switch from Sefard to Ashkenaz but you cannot switch from Ashkenaz to Sefard.
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The Divrei Chaim paskens you can switch from Ashkenaz to Sefard but you cannot switch from Sefard to Ashkenaz.
The Igros Moshe paskens you can switch from Sefard to Ashkenaz but you cannot switch from Ashkenaz to Sefard.