Multi-system computer chooses boot mode. In the long run, uefi is more advanced. Traditional bios coexist, whether you want to try UEFI boot in old computer (if supported), or want to pre-install Win8 The /8.1 system is replaced with other operating systems and all need to be familiar with the method of switching between UEFI/Legacy BIOS.
In the long run, UEFI is inevitably the mainstream development trend. However, since many users are still using Win7, especially 32-bit Win7 (PC is generally configured with 64-bit UEFI, which can only boot 64-bit systems) and other low-level operating systems, the status of LegacyBIOS+UEFIBIOS coexistence may need to continue for a long period of time. So, whether you want to try UEFI boot on an old computer (if supported), or if you want to switch a pre-installed Win8/8.1 system to another operating system, you need to be familiar with how to switch between UEFI/LegacyBIOS. This article will take Lenovo pre-installed Win8 computer as an example to use Chinese and English picture comparison method and combined with text description to explain several setting options and their meanings in the UEFI/Legacy switching process. Xiaobian’s level of understanding is limited. If there is a misunderstanding in the text, I hope to point it out.
Hint: The BIOS settings interface is different for different computers, but the options you need to set are basically the same, but the options will change. In addition to knowing how to do it, it's best to know why you do this, so you can do it all the time!
First, press the power button (or restart) of the computer. When the system shuts down the computer and enters the restart process, press the shortcut key repeatedly to interrupt the computer and enter the BIOS setup interface. Note: Different computers have different shortcut keys to enter the BIOS, usually F1, F2, DEL, ESC, etc. The specific setting options are as follows:
1, OSOptimizedDefaults system default optimization settings
In some pre-installed Win8/8.1 computers, this option will be available. Computers without pre-installed Win8/8.1 are generally not available. This setting option. Switch to the "EXIT" tab, as shown below (above in English, below is the Chinese map. The same below) can be found in it:
OSOptimizedDefaults is a “Top] setting options, when this option is enabled, the BIOS will automatically restore all relevant options (ie each option described below) to the standard settings required to pre-install Win8/8.1 default startup mode, ie enable UEFI+ to open Safe start.
When you need to switch to UEFI: If you only install Win8/8.1, you can select “Enable” and other situations “Disable”;
When you need to switch When you go to Legacy: You should select “Disable”.
2. CSM Compatible Module Settings
Switch to the “Startup” tab. As shown below
CSM (CompatibilitysupportModule) represents a compatible module. This option is designed to be compatible with devices that can only work in legacy mode and operating systems that do not support or do not fully support UEFI. For example, at present, many discrete graphics cards do not have GOPBIOS support and cannot work normally in UEFI mode. In this case, it is necessary to "Enable" & Crd. It should be noted that the CSM option and the secure boot (described below) conflict on a computer configured with Class 2 UEFI. Both can only be turned on at the same time.
When you need to switch to UEFI: It is recommended to select “Disable” under the condition that Win8/8.1 is installed and you need to enable safe boot. In other cases, select “Enable”.
When you need to switch to Legacy: You should select “Enable”.
3. BootMode startup mode selection
This option is still in the “Startup” tab, ie BootMode (boot mode), which is the main switch when switching UEFI/LegacyBIOS. Setting Options. There are generally three options:
Auto: Automatically starts in the order in which the device list is started, preferably in UEFI mode;
UEFIonly (UEFI only): only selects UEFI-enabled conditions Device startup;
Legacyonly (Legacy only): Select only devices with Legacy startup conditions to start;
Select one as needed.
4. SecureBoot Secure Boot Settings
This option is invalid in Legacy mode and does not need to be set. Secure boot is an optional standard for UEFI and is not available on some UEFI computers. A motherboard with a secure boot is factory-installed, allowing some reliable public keys to be built. In this way, only the software (system) signed with the corresponding private key can be loaded by the authentication of the built-in public key during the startup process. Malware cannot be certified and naturally cannot be loaded. Therefore, this will ensure that the computer is safe to boot. UEFI does not specify a specific issuer for the public key, and on computers pre-installed with Win8/8.1, Microsoft forces OEMs to adopt a secure boot standard and place Microsoft's own public key. Because the pre-installed Win8/8.1 computer is safely booted by default, it is “Enable” status, which causes other operating systems including Win7 to be booted by default (Note: other systems have been certified) , but the user can choose to turn it off. Take a look at the specific settings options:
Switch to the Security tab, as shown below
Then open the safe boot option settings, as shown below
There are two options:
The first, Secureboot option. If we want to install a system other than Win8/Win8.1/Win10 in UEFI mode, it is recommended to turn it off. In addition, you need to pay attention to the conflict between the CSM and the secure boot mentioned in the CSM option settings above. In view of this, we usually set it to “Disable”, and in the off state, there is no need to consider the second setting option.
Second, Reset to Setup Mode/Restore Factory Keys option. This option is used to clear or restore the built-in secure boot key. Generally we do not need to set this option. If your computer is pre-installed with Win8/8.1, you have changed the relevant settings options, and now want to restore the default settings (including turning on secure boot), you can use this option to restore the secure boot key to the default value.
The above are several setting options to be aware of when switching between UEFI/LegacyBIOS.
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