Installation required: UEFI and BIOS switch

Tip: different computer BIOS settings have different interfaces, but the options are basically the same, but the options are changed.

First, start or restart the computer. When the system shuts down the computer and enters the restart process, press the shortcut key repeatedly to interrupt the computer startup and enter the BIOS settings interface. Note: the shortcut keys for entering BIOS on different computers are usually F1, F2, DEL, and ESC. After entering the BIOS interface, the specific settings are as follows:

1. Default OS Optimized Defaults system optimization settings

OS Optimized Defaults is a "top-level" setting option. When this option is enabled, the BIOS will automatically set all related options (that is, each of the options described below) resume to the standard settings required by the default boot mode of the pre-installed Win8/8.1, that is, enable UEFI + to enable secure boot.

When you need to switch to UEFI: If you only need to install Win8/8.1, you can select Enable and Disable in other cases )";

To switch to Legacy, select "Disable )". In some pre-installed Windows 8/8.1 computersOS Optimized DefaultsThis option. Switch to the "EXIT" tab:

2. CSM compatibility module settings

CSM (Compatibility support Module) indicates a compatible Module. This option is designed for compatible devices that only work in legacy mode and operating systems that do not support or fully support UEFI. For example, many independent video cards do not support gop bios and cannot work normally in UEFI mode. Enable CSM must be enabled. Note that the CSM option conflicts with the safe start (which will be described below) on the computer with Class 2 UEFI configured. Either of them can be enabled at the same time.

To switch to UEFI, we recommend that you select "Disable" only when Win8/8.1 is installed and the secure start must be enabled. In other cases, select "Enable )";

To switch to Legacy, Select Enable )".

3. Select Boot Mode

This option is still on the "start up" tab, that is, the Boot Mode. This is the main setting option for UEFI/Legacy BIOS switching. Generally, there are three options:

Auto (automatic): The device is automatically started according to the sequence in the startup device list. UEFI is preferred;

UEFI only (UEFI only): select only devices with UEFI startup conditions to start;

Legacy only (Legacy only): select only devices with Legacy startup conditions to start;

Select one of them as needed.

4. Secure Boot security startup settings

This option is invalid in Legacy mode and does not need to be set. Secure boot is an optional standard for UEFI, which is not available on some UEFI computers. When a secure boot motherboard is used, some reliable public keys can be built in. In this way, only software (systems) signed with the corresponding private key can be loaded during the startup process through the built-in public key authentication. Malware cannot be authenticated and cannot be loaded. Therefore, this can ensure the computer startup security. UEFI does not specify the specific issuer of the public key, while on a computer preinstalled with Win8/8.1, Microsoft forces OEMs to adopt the secure startup standard and place the Microsoft public key. The default Enable status is "Enable" when Windows 8/8.1 is pre-installed, which means that other operating systems, including Windows 7, cannot be booted by default. Note: currently, other systems have been authenticated, but you can disable them. To see the specific setting options:

Then enable the secure startup option settings, as shown in the following figure.

There are two options:

First, the Secure boot option. We recommend that you disable Win8, Win8.1, and Win10 in UEFI mode. In addition, pay attention to the conflict between CSM and secure startup mentioned in the CSM option settings above. In view of this, we usually set it to "Disable". In the off state, we do not need to consider the second setting option.

Second, Reset to the Reset to Setup Mode/Restore Factory Keys option. This option is used to clear or restore the built-in secure start key. Generally, you do not need to set this option. If your computer is pre-installed with Win8/8.1, you have changed the related settings, and now you want to restore the default settings (including enabling secure boot ), you can use this option to restore the secure start key to the default value.

The preceding settings are required for UEFI/Legacy BIOS switching.