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Lenovo Notebook Broadcom Series 6.3 1. 139.2 How to solve the installation failure without signature?
I hope my answer can solve your concerns.

It was caused by the driver's uncooperative. Don't use the driver wizard, it's all public drivers.

First, when buying a notebook, the manufacturer will match the system disk of this computer. I suggest you look for it, because that driver is most suitable for your computer.

Secondly, if the driver disk provided by your manufacturer is lost, you can download a Tencent computer housekeeper and do a security check on your computer to see if the driver problem causes your computer shortcut keys to fail.

Third, open Tencent Computer Manager-Toolbox-Hardware Detection-and install the driver. Among them, Tencent Computer Manager will automatically match the computer driver for you.

If you have any other questions, please continue to ask them.