Install win7 on an EFI motherboard computer with a Windows 8 system preinstalled (legacy installs win7)

Because the computer pre-installed with the Win8 system has secure boot, the system cannot be directly installed through the EFI shell boot, and even if secure is disabled
Boot and EFI only support 64-bit systems and must be partitioned using GPT. This is tough for users with hard disks smaller than 2 TB or no more than 4 primary partitions, so we should use legacy + MBR (legacy is the BIOS we were familiar with before, while EFI is the new BIOS)

This post uses the Asus n56 notebook as an example. The bios of other machines may be slightly different, but it is roughly the same,Important: Installing the system may cause loss of all files on your computer. copy the files on your hard disk to other mobile hard disks, USB disks, and other places for backup!

required tools:
1. win7 System ISO (use the original version or ghostversion whenever possible): http://diybbs.zol.com.cn/2/308_12377.html
2. ultraiso,: http://diybbs.zol.com.cn/15/225_141810.html
3, a U disk (not less than 4G)

Tutorial description:
This tutorial uses the legacy + MBR system installation method. If you want to use the GPT Installation Method for the following reasons, referTutorial:Http://diybbs.zol.com.cn/3/308_22291.html

The advantages of GPT over MBR are:
1. Support for hard disks larger than 2 TB
2. It can be divided into more than 4 primary partitions.
3. Higher security

Tutorial start:
1. Download the above tools 1 and 2 to create a USB flash drive. If not, refer to the Tutorial:Http://diybbs.zol.com.cn/3/308_20409.html

2. Press the power key to start the system, and then press ESC to enter the BIOS. For example, (here is how Asus enters the BIOS. The methods for other machines are different ):

3. Switch to the boot tag and Set Launch
CSM is changed to enabled. This option may also be called legacy and so on. Different boards have different names. This option is used to change the BIOS of EFI to the traditional bios of legacy.

4. After modification, see:

5. Switch to the security label and find secure boot.
Change enabled to disabled. In this step, Microsoft'sSecure
Boot, which will make the installation of the USB flash drive startup system unrecognizable.

6. After modification, see:

7. Change the boot sequence to USB flash drive boot. Some motherboard can also be modified on the BIOS interface, insert the USB flash drive, and select Save
Change and exit

8. Now you have changed the BIOS from EFI to the legacy bios. The following system installation steps are the same as the original ones. Refer to Step 1 or other Tutorials:System download and Installation
Complete Record

9. One thing to note is that if your computer is preinstalled with a Win8 system, the partition must be GPT and all partitions must be deleted, then re-partition (as a virtual machine, for reference, the partition type is different from the actual ):