When I toggle on the install via USB in developer mode:
I tried everything to no result, then read somewhere that you should use VPN and connect under China to unlock your phone's bootloader. Applied the same solution here and it worked!
Turning off Wi-Fi and enabling Mobile Data (thank you Xiaomi for wasting my money to enabling mobile data which the last one I didn't have) on Xiaomi 4A did not work for me. Every time I tried to enable Install App Via USB
it displayed me "the device is temporarily restricted". So, I found this solution:
Turn on VPN onto your device with these parameters and try again toggle Install from USB
:
China server from https://www.vpngate.net/en/
vpn
vpn
vpn
For me on a rooted MIUI v.8.5.1 I just need to:
after doing that both Install via USB and USB debugging started to work.
All you have to do is Turn your Wi-Fi off, turn on mobile data, and then enable the setting for "Install via USB". It'll go through.
Source: http://en.miui.com/thread-544718-1-1.html
These steps worked for me after struggling 1 hour, Not needed to connect to Chinese server.
(1) Turn Off your Wi-Fi
(2) Turn Off your Mobile Data
(3) Turn On "Install via USB" from Developer Option of your device.
4) It will show the Error "No network found"
5) Now Turn On your Mobile Data
6) Again Turn on "Install via USB"
7) it will work, now
Happy!
I got this problem in my Xiaomi Mi5 from India. All the mentioned solutions didn't work in my case. Then I tried to figure out the Core reason behind it and solve it. In MIUI, in order to change "Install via USB" option, you must be connected to the internet and signed in your Mi account. Due to some reason, requests from out of the China servers are getting rejected, so I connected to one open China VPN and tried again to enable 'Install via USB' and I got success. For detailed solution and VPN details, see this useful Youtube video: https://youtu.be/MeKUJlD-Ke4