How to change ESN for license?

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If the ESN has changed due to the reasons such as incorrect ESN, the license file is unavailable. You need to apply for a new license file.
If the revoke code has obtained, you can use self-help application without approval. If the revoke code cannot be obtained (for example, the license is not loaded to the device and the ESN is incorrect), you must apply for it and obtain approval.
For details, please see chapter 4.3 in License Usage Guide.

Other related questions:
How to check the ESN of the U1980
Two methods are available: 1. Using commands: Run the show license command. 2. Using the web: Log in to the web management system and choose System Management > License Information.

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