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Locate "Settings" on your phone.
Tap on "My Device."
Select "All Specs."
Tap on "MIUI Version" 7-10 times consecutively. You will see a prompt saying "You are now a developer."
Go back to the previous page and enter "Additional Settings."
Tap on "Developer Options" and turn on "USB Debugging."
Tap "OK" on the "Allow USB Debugging?" pop-up to successfully enable USB Debugging.
Note: Xiaomi devices require "USB Debugging (Security Settings)" to be enabled.
PS: Xiaomi devices need to be logged in with a Xiaomi account to enable "USB Debugging (Security Settings)."