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Error code E21 occurs when you start up your Xbox 360 console

You see the following error code and message when you start up your Xbox console:

E21
Your Xbox requires service

This may mean that the installed Xbox console software is not the most current version, and that you need to update it.

Update your Xbox 360 console software. For details, see How to get a new Xbox 360 update.

If you keep experiencing the problem, contact Xbox Support.

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