Help to restore my IMEI with MTK droid tools - imei/nvram button greyed out

Dears,
I have HTC Desire 820ts Dual SIM rooted mobile . I need to restore IMEI for it using MTK droid tools .
every thing is good (green square showed under and (root shell) beside it and NO Root button showed) but IMEI/NVRAM Button is greyed out so i cant restore IMEI .
can any one help me please ASAP .
thank you

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