I don't think your problem is signature verification, but to disable it depends on the phone. While connected to fastboot, type in "Fastboot oem ?" and that will give a list of available commands, if it's able to disable signature verification it'll be listed somewhere there, otherwise you won't be able to do it via Fastboot.
Disable driver signature enforcement [Windows Guide] May 18, 2020 How to Disable Driver Signature Enforcement on Windows 10 Jan 17, 2019 how do I disable driver signature enforcement win W10 Aug 18, 2017
Signature check failure issue - OfficeScan 11.0
Feb 04, 2016
Nov 05, 2016
Nov 24, 2016 Jul 03, 2017 · 64-bit versions of Windows 10 and 8 include a “driver signature enforcement” feature. They’ll only load drivers that have been signed by Microsoft. To install less-than-official drivers, old unsigned drivers, or drivers you’re developing yourself, you’ll need to disable driver signature enforcement. May 18, 2020 · Disable driver signature enforcement permanently; 1. Change the Startup settings. This is the simplest way to disable driver signature enforcement on Windows 10 but bear in mind that this method will only disable driver signature temporarily. After you restart your computer driver signature enforcement will automatically turn itself on. Jan 17, 2019 · Method 1 - Use Advanced Startup Options to Disable Driver Signature Enforcement. The advanced startup options allow you to disable driver signature temporarily. i.e, once you reboot the system next time, the driver signature enforcement will be automatically enabled. In general, this method will suffice for most users. May 02, 2018 · Don’t worry because we’ve got you covered. Simply follow our instructions below and you will be able to disable driver signature enforcement on Windows 10. Method 1: Changing the startup settings. One of the easiest ways to disable driver signature enforcement on your computer is to tweak the startup settings.