Win8 replacement win7 system need to pay attention to what?

Note:
1, first part of the Win8 system to turn off the quick start function to enter the BIOS normally (if you can not enter, please ignore);
2, need to pass the UEFI boot mode in the BIOS Change to the traditional mode: BIOS → EXIT → OS Optimized Defaults, change “Win8 64bit” to “Others”. Then go to "BIOS→Boot", set the Boot Priority to "Legacy First", set the Boot Mode to "Legacy Support", and some computers need to turn off the secure boot "Change Secure Boot to "Disabled"" and then modify the device boot. Order, install the system with a USB flash drive or CD-ROM drive.
3, involving the conversion of the hard disk from the GPT partition to the MBR partition, all partitions of the random Win8 system need to be deleted (including the boot partition, the system repair partition, the reserved partition of the GPT partition table, the functional partition of the one-click recovery, Win8 system partition, user data partition and one-click recovery data partition, etc., so data backup before system replacement is essential.