[Missing imei entry]Warning, nvram posible damaged!!.

Oppo F5 CPH1723
No Network Problem
*#06# IMEI Ok But Tac Invalid

Its Means Some One Already Changed Its IMEI Strange For Me
[If Some One Have Idea About IMEI Repair Plz Guide]
NCK BoX Read Info Here

Code:

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Action : Boot Info.
 Selected OPPO:F5
 Exe version: NCKBox AndroidMTK 1.9
 Reinsert phone battery.
 Battery must be charged.
 Keep VOL- button untill inserting USB cable.
 Detected : MediaTek USB Port (COM17)
 Boot mode: Brom
 Phone detected...Please wait
 BBCHIP: 6763 1 ca01
 Using Algo 3.
 Helio MT6763 phone detected, swithing to helio api
 Loading Custom Preloader
 Helio enabled DRAM in First Da: TRUE
 BBCHIP MT6763
 [1]Storage EMMC
 EMMC FW VERSION: 00:00:00:00:00:00:00:00
 EMMC CID: 15010052483634 : 000000000000000000
 EMMC UA SIZE: 0xe8f800000   
 BOOT STYLE: EMMC BOOT
 FULL LENGTH: 0xe90400000      [58.254 GB]
 Status: USB_HIGH_SPEED
 Detecting high speed port, wait......
 If driver not installed, install high speed port driver.
 If not need high speed port, disable it.
 After repeat opperation.
 Detected : MediaTek DA USB VCOM (Android) (COM18)
 Build ID: N6F26Q
 Version: 7.1.1
 Build Date: Fri Nov 17 01:18:22 CST 2017
 Manufacturer: OPPO
 Mediatek Version Release: CPH1723_11_A.07_171116
 Model: OPPO CPH1723
 Brand: OPPO
 Device: M6763A
 Display ID: CPH1723EX_11_A.07_171116
 FRP partition: /dev/block/platform/bootdevice/by-name/frp
 This phone have FRP partition.
 SN: VWJJZPDAQ8ROLR5H
 [3][Missing imei entry]Warning, nvram posible damaged!!.
 [helio]Wait untill phone will start charging.
 [0]All done.

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