1. Open cmd, type bcdedit/settestsigningon and press enter (to prevent the problem of driving digital signature in the future), then restart the computer and do the following.

2, open the MiFlash.exe, and then open the device manager (right-click on my computer-management-device management) ready.

3. Connect the Usb cable to the computer (don't connect the mobile phone yet), then open the battery cover, fasten the battery and pull out the mobile phone card. Next, you will see two metal contacts next to the sim card slot.

4. Then, one end of the wire is wound to form a channel, and the other end of the wire is connected with the negative electrode of the battery.

5. Next, touch the metal contact next to the sim card slot with the two sharp feet of tweezers (hold still), and finally connect the usb data cable with the mobile phone terminal.

6. At this time, if you see a QHSUSB_DLOAD in the device manager, congratulations. You're halfway there. Since your computer has loaded MiFlash, the autoload driver will assign this device to Qualcomm HS-USBQDLAODER 9008 (COM * *) (* is two numbers, which are different for different computers).

7. Then switch to the MiFlash window, click F5 to refresh, and then you will see that MiFlash has detected your black brick II battery.