oppo F7 imei repair Error

Power off the phone, disconnect and reconnect the battery(if possible) and connect USB cable...
Using Port:
AUTH info: MTK, version: 1
Boot META MODE...
Hold the VOL UP to force MediaTek BootROM.
Scanning BootROM or Preloader port... Done
Detected [PL] MediaTek PreLoader USB VCOM_V1632 (Android) (COM37)
Connection status: EHCI:HUB:HUB:USB 2.10 High-Speed
USB Driver: [MediaTek Inc.] wdm_usb, version: 3.0.1504.0, date: 1-22-2015
Boot META MODE from PreLoader ... Done
Scanning...

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oppo F7 imei repair Error