I'm sorry about the issue. Where did you enter the code online? Which website, etc.?
Do you mean you cannot use the phone at all?
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Please try the following fix:
Note: The steps must be done correctly; you may have to try a couple of times, or so.
You can also see the video instructions at the website below; it may be easier:https://www.youtube.com/watch?v=34v8HMC9B98
Please reply at the box below to continue. Thank you.