First of all, your phone should be rooted first, if you don't have root, get it quickly, and then install an RE file manager.
Specific steps:
1. Start by opening the RE Manager.
2. Find the SYS folder and open it
3. After opening the SYS folder, find the Devices folder and open it
4. After opening the Devices folder, find the SYSTEM folder and open it
5. After opening the SYSTEM folder, find the CPU folder and open it
6. After opening the CPU folder, find the CPU1 folder and open it (since I am using the old Mi One, I only have dual cores, and the method is similar for friends with 4 cores and 8 cores)
7. After opening the CPU1 folder, find the Online text, long press this text to select Open in the text editor mode
8. Change the number 1 to 0 in the text editor, press the setting key, select Save and exit in the pop-up selection box.
Well, your CPU1 is offline and the setup is complete. Don't hurry up and go to System Optimization to see if your CPU1 is offline~
On the other hand, if your ROM defaults to CPU1 offline, then through this tutorial, you can also enable the offline CPU to be online.
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