Trying to change my gamertag to what it was in a previous date; how can I go about doing this?
Follow the instructions in this link to change your gamertag. As long as the tag isn't in use you can claim it but it will cost 800 Microsoft Points regardless of whether you had it before or not.
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It costs 800 microsoft points
Sign in on to Xbox LIVE gamertag that you want to change.
Go to Social and then select your gamertag.
Select Change Gamertag.
Select Enter New Gamertag.
Enter your old previous gamertag