Click to enter the phone settings page.
After entering the phone settings page, you will see multiple options. Drag the page up and down to find and click the security option in the list.
Click more security settings after entering this page.
After entering this page, click Install Exogenous Application to open the installation permission of software Exogenous Application.
The above is how Huawei mobile phones turn off software signature verification. I hope it helps you.