Digital signature is something made by Microsoft. They have an HLC, which is a hardware test bench, that is to say, it has passed the test of Microsoft operating system, and the operating system based on this hardware is reliable. In fact, what is not available on HLC is not necessarily unreliable, because Windows is really popular now. If this prompt appears, it means that the operating system warns that the hardware has not passed Microsoft's confirmation, which may lead to software failure or hardware operation problems. Actually, don't worry, just pack it.