What I just said doesn't seem to work I tried ...
It doesn't matter. Download 360 Mobile Guardian and 360 Optimizer for installation, and put systemui.apk in the systemapp folder under 360 folder in sd card. If not, you can create this folder, open the 360 optimizer, open Software Management → System Slimming → Recycle Bin, click Systemui on the status bar, click Restore, and then restart the phone. My mobile phone is also a wasp, which harms others and yourself. Cloud applications are restored in the same way. I hope it helps you.