Mi Unlock - 6.5.406
Fix: Click the gear icon in the top right corner of the Mi Unlock tool and click "Check driver" to reinstall the Fastboot drivers. Alternatively, try a different USB port (preferably USB 2.0) or a different cable.
Mi Flash Unlock Tool Review: Safely Unlock Xiaomi Bootloaders - Dr.Fone mi unlock 6.5.406
The tool does not natively support macOS or Linux. Fix: Click the gear icon in the top
: Go to Settings > About Phone > Tap MIUI Version 7 times. Bind Account : Go to Settings > Additional Settings > Developer Options . Enable OEM Unlocking and USB Debugging . Tap Mi Unlock Status and select Add account and device . : Go to Settings > About Phone > Tap MIUI Version 7 times
Mi Flash Unlock Tool Review: Safely Unlock Xiaomi Bootloaders - Dr.Fone
: Both must be enabled in the Developer Options menu.