oppo F7 imei repair Error

i have a problem in oppo F7 imei repair
Error: failed to read PCBA Number!

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...

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oppo F7 imei repair Error

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