When you download a "Fastboot ROM" for a Xiaomi phone, it comes as a compressed package (usually .tgz ). Inside this package is a folder containing several .bat files—these are the scripts that tell the Mi Flash Tool how to wipe your data and install the new software. The error triggers because of one of two things:

Ensure you downloaded a rather than a Recovery ROM. Look at the file extension. It must end in .tgz or .tar .

Have you ever connected your Xiaomi or Redmi phone to your computer, ready to flash a fresh ROM, only to have your plans derailed by an error message stating, "Mi Flash Error Cannot Find File flash_all_lock.bat"? It's a common and frustrating problem that stops the flashing process in its tracks. But don't worry, this detailed guide is here to explain what this error means, why it happens, and exactly how to fix it so you can get back to customizing your device. In this article, we'll provide a comprehensive, step-by-step walkthrough to help you understand and resolve the flash_all_lock.bat error for good.

: Placing the unzipped folder inside directories that have spaces, symbols, or non-English characters in their folder names (e.g., C:\Users\John Doe\Desktop\My Phone\ ).

The files were extracted into nested folders, making the tool unable to find the .bat file in the root path. Step-by-Step Solutions (2026) Method 1: The Easiest Fix (Check ROM Folder Structure) Before changing settings, verify the files exist. Navigate to your extracted ROM folder. Look for a folder (often named images ).

If you've moved the folder to your and still see the error, let me know: What phone model are you flashing? Which version of Mi Flash are you using? Did you unlock your bootloader already? Share public link

Open the new folder. If you see a single file inside, extract that file again.

This error occurs when Xiaomi Mi Flash (or a related fastboot flashing process) cannot locate the script file named flash_all_lock.bat (or flash_all_lock) required to relock the bootloader or flash a fastboot ROM. Causes include wrong ROM folder structure, incorrect ROM package type, incomplete/unzipped ROM, misnamed files, or using the wrong flashing tool/version.

This method completely avoids the Mi Flash Tool GUI error.