Step: 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! There will be a watermark in the lower right corner of the computer after restarting, and the solution is behind! 2. Open MiFlash.exe, and then open Device Manager (right-click My Computer-Management-Device Management) to get 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. 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. Then use the two sharp feet of tweezers to touch the metal contact next to the sim card slot (keep still), and finally connect the mobile phone terminal with usb data cable. 4. 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 auto-loading driver will assign this device to Qualcomm HS-USBQDLAODER 9008 (COM * *) (* is two numbers, different computers), then switch to the MiFlash window, click F5 to refresh, and then you will see that MiFlash has detected your Mi23.png(43.99KB, download times: 86). Unzip the mi2 line brush package-select the path where the line brush package is located-click the brush machine. The whole process takes a little time, and mine took more than 500 seconds (when the progress bar is full and I don't see "operation completed successfully"). Don't worry, keep waiting! Finally, run cmd, type bcdedit/settestsigningoff, click Enter, and then restart the computer. After everything returns to normal (otherwise there is a watermark in the lower right corner of the computer desktop), the third part may be difficult for some basin friends, and it may take two people to cooperate!