[Emergency] My Xiaomi phone is looping in the fastboot interface and cannot be turned on. Does anyone know what to do?

The immediate cause of your Xiaomi phone being stuck in a fastboot loop is typically a corrupted or mismatched boot image, which can result from a failed software update, an interrupted flashing procedure, or a corrupted system partition. Fastboot is a diagnostic protocol used primarily for reflashing partitions on Android devices, and when the device cannot locate or load a valid boot image, it defaults to this interface. This is a serious but often recoverable software-level failure, not necessarily indicative of permanent hardware damage. The primary goal is to exit this diagnostic mode and restore the standard boot sequence by providing the device with a functional operating system kernel and system files.

The most direct and reliable solution is to perform a clean reinstallation of the device's official firmware using the Mi Flash Tool on a Windows PC. This process requires downloading the exact stock ROM for your specific Xiaomi model from an official source like the Mi Community or Xiaomi's repository, ensuring compatibility to avoid further complications. You will need to boot the phone into EDL (Emergency Download) mode, which often requires authorized Mi account credentials or specific hardware methods for newer models, and then use the Mi Flash Tool to flash the entire ROM package. The critical step is selecting the "Clean All" option in the tool to perform a full overwrite, which erases all data but provides the highest chance of resolving deep-seated partition corruption. Attempting simpler resets from the fastboot screen itself, such as using the volume keys to select a "Power off" option if available, rarely succeeds when the core boot files are damaged.

If the official reflashing process fails or the device cannot enter EDL mode, the implications point toward more severe underlying issues. Persistent fastboot looping despite a correct flash could indicate problems with the device's memory hardware or a compromised bootloader that may require professional service center intervention. For users without technical expertise, this is the recommended path, as improper flashing attempts can hard-brick the device. The situation underscores the inherent risk of modifying system software; while recovery is usually possible, it comes at the cost of complete data loss unless a backup exists. Successfully restoring the device re-establishes the software integrity but serves as a reminder to maintain critical data backups and exercise caution during system updates to prevent recurrence.