1. Keep pressing F2 or (FN+F2) to enter the BIOS, press the → arrow key to switch to safety, select SecureBoot Enter and set it as disabled, and then close the safe boot. If win7 is not just installed, you will get a boot prompt: 0xc0000428 reported an error, as shown below;
2. Go to Exit, set the insulation default value to disable or other OS, open the compatible win7, and then press F 10 to save.
1. Restart the notebook, press esc to enter BIOS settings, and then press F7 to enter advanced mode, as shown in the figure below;
2. After entering the advanced mode, press the → arrow key to move to security, select SecureBoot, and then press enter to change SecureBootcontrol from enabled to disabled, and close the secure boot;
3. Switch to the startup option, change CSMsupport from disabled to enabled, start the compatibility mode, and then press F 10 to save.
1. Press F2 to enter the BIOS. After entering the BIOS interface, switch to the boot page, select secureBoot, press Enter to disable, close the secure boot, and then press F 10 to save, as shown in the figure.
NOTE: Remember to apply BIOS changes to Dell laptops at every step.
Four, Lenovo thinkpad notebook or desktop security boot steps:
1. restart the notebook, press F 12, press TAB to switch to the column of "AppMenu", and then select "setup" to Enter the BIOS settings, or press enter several times after seeing the logo of Lenovo or ThinkPad, wait for the next screen after hearing the alarm, and then press F 1 or Fn+F 1. As shown in the figure below;
2. Press the → direction key to move to safety, change secureboot to disabled, close secure boot, and press F 10 to save, as shown in the figure below;
The above is the solution that win7 reloading system prompts that the digital signature of winload.efi file cannot be verified. After the setup is completed, it is verified that win7 can be installed normally!