By following this comprehensive guide, you should be able to overcome the Unknown Error 1004 and successfully unlock your Xiaomi device's bootloader. Good luck!
Why this works forces Xiaomi’s server to re-evaluate your "binding period." Some regional servers cache your SIM ID incorrectly. Changing the SIM refreshes the handshake.
(Wait 10 seconds, the screen will go black—this is EDL mode) Unknown Error 1004 Mi Unlock
Faulty or outdated USB/ADB drivers on your computer.
Then, just when victory seemed near, the tool spits out: By following this comprehensive guide, you should be
Discrepancies between the SIM card in your phone and the Mi Account logged into the tool.
Try an older or different version of the Mi Unlock tool if the current one persists with the error. Changing the SIM refreshes the handshake
Use the original Xiaomi USB cable, try a different USB port (preferably USB 2.0), and ensure all drivers are installed via the Mi Unlock Tool settings. Quick Checklist for Success
Xiaomi’s unlock servers are notoriously inconsistent. If their authentication server times out during the 5-second window the bootloader is waiting, the tool spits out "Unknown Error." This often happens during weekends (high traffic) or after a major MIUI update.
Knowing the OS version can help narrow down if you need specific HyperOS community permissions first.
If the computer can't "see" the device's hardware ID correctly, it defaults to a 1004 error.