Introduction Flashing firmware on a Xiaomi device is usually a straightforward process using the Mi Flash Tool. However, users frequently encounter the error: "error: cannot find file flash_all_lock.bat." This error typically halts the flashing process before it begins, causing frustration for those trying to update, unbrick, or restore their devices to factory settings. Understanding why this happens is the first step toward a quick fix. The Root Cause
The Cause: If you have "clean all and lock" selected, but the ROM folder you downloaded doesn't contain the flash_all_lock.bat file (common in some custom or older Fastboot ROMs), the tool will throw an error. mi flash error cannot find file flashalllockbat
This happens right when you try to flash, and the process stops immediately. Introduction Flashing firmware on a Xiaomi device is
If Mi Flash cannot find this file, it means the tool is looking in the wrong folder or the ROM is incomplete/corrupted. Open Mi Flash Tool
Sometimes the .tgz file downloads partially. When extracted, critical batch files including flash_all_lock.bat are missing.
Conclusion