: You must have a Mi Account logged into the device.
To let Xiaomi know you intend to unlock the device, you must enable hidden settings: How to Unlock Bootloader on Xiaomi Mi CC9 and Mi CC9E How to unlock Bootloader in XIAOMI Mi CC9 Meitu...
: A Windows PC and the original Xiaomi USB cable are recommended for a stable connection. Battery : Ensure your device is charged to at least 50% . Step 1: Enable Developer Options & Bind Account : You must have a Mi Account logged into the device