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: This indicates an authorization mismatch. The device model or firmware version may be too new for the exploit payload embedded within that specific version of the tool. Which chipset does your phone use (MediaTek or Qualcomm)?
No verified, widespread software exists under the name "i--- Smt Bootloader Unlock Tool," and it likely appears only in unverified or spam channels. Official bootloader unlocking requires manufacturer-specific tools, such as the Mi Flash Unlock Tool, which often require waiting periods and trigger factory resets. For safe, official methods, visit the Xiaomi Mi Unlock page or follow Android guidelines at source.android.com i--- Smt Bootloader Unlock Tool
: Removes Google's Factory Reset Protection (FRP) barrier after an un-synced hard-reset. : This indicates an authorization mismatch