Red mi device issue on enable "Installl via usb"

Question

I am using the mi note 5a device with MiUI 9. but when I enable the option of Install by USB developer option its show error. can anyone help me how to fix that I was using some process that below

1. Settings -> Additional Settings -> Developer options -> Turn off Miui Optimizations -> Restart

2.Security -> Permissions -> Gear Icon at top right corner -> Turn On “Install via USB”

3. Settings -> Additional Settings -> Developer options -> Turn On/Off “USB Debugging” -> Turn On “Install vis USB”

None of them is useful in my issue

Answer 1

Try this

• Turn off WIFI and Turn on mobile data..
• Then go to setting --> additional settings --> developer options and turn off MIUI Optimization
• After that go to security --> permission --> setting icon on top right corner and turn on install via usb.
• After that go to setting --> additional settings --> developer options --> turn on usb debugging --> turn on install via usb

Answer 2

try this :

• Disable WiFi
• Enable Data Connnection
• Enable “Installl via usb”

Answer 3

First Check in your computer USB driver is installed or not. If not than install ADB driver.