After entering the settings window, locate and open "Update and Security". If you can't see it, drag the scroll bar on the right to see it.
To the Update and Security window, first select Restore from the options on the left.
Then come to the interface on the right side of the recovery, find "Advanced Options" and click the "Restart Now" button under it.
Enter the blue interface and select an option. Here, select "Troubleshooting".
In the next interface, there is only one option, namely "Start Settings". The options here are slightly different for different system versions. Some have several options here, but they all choose "startup settings".
In the startup settings interface, we only introduce some advanced functions, and there is nothing to choose from. Just press the "restart" button directly.
Here, you can really restart the computer, and you will enter the advanced options interface with a blank screen. The interface of some systems is blue, which is caused by different systems. Here, select the "Disable driver forced signature" item, press enter, and after entering the system, you can install unsigned drivers.
This method is one-off. If you need to install an unsigned driver next time, do it again according to the above method.