Lenovo K900 - IMEI was changed to 004999010640000. How do I Restore NVRAM?

Hello.
I made the change from standard firmware through my K900 for Rom Vibe 1418.
But the flash of the end of the IMEI is lost and can not bring it back. I've tried all the cases that are on this site and have not had success. Can you help me?

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