The error happens because the Xiaomi Mi Flash Tool cannot find the automated script required to finish the flashing process. This roadblock usually comes up when the "Clean all and lock" option is selected at the bottom of the tool while trying to install a Fastboot ROM on a Xiaomi, Redmi, or POCO device. Root Causes of the Error
Several conditions lead to this error. Understanding the root cause will save you time.
Recent Xiaomi fastboot ROMs (MIUI 12.5+ and HyperOS) have started omitting flash_all_lock.bat on purpose. Why?
Check the file extension of the original firmware package you downloaded. mi flash error cannot find file flashalllockbat
Note: If your device's bootloader must be locked, or if "Clean all" throws a similar error for flash_all.bat , proceed to the next steps. 2. Verify You Downloaded a Fastboot ROM
To fix the problem, you first need to understand what Mi Flash Tool is looking for and why it cannot find it.
Switch from “Clean all and lock” to “Clean all” and continue flashing. If you must lock the bootloader, find an official Fastboot ROM that explicitly includes flash_all_lock.bat and verify compatibility with your device’s anti-rollback index. The error happens because the Xiaomi Mi Flash
The most frequent mistake is selecting the main folder rather than the "images" folder, or vice versa. Open the Mi Flash Tool and click Select . Navigate to your extracted ROM folder.
Right-click your downloaded .tgz file and extract it. This leaves you with a .tar file.
Alternatively, the error surfaces if the firmware path is nested too deeply inside extracted subfolders, causing the tool to look in the wrong directory. Step-by-Step Fixes 1. Change the Flashing Configuration Understanding the root cause will save you time
Windows file paths have limitations, and the Mi Flash Tool is sensitive to them.
How to Fix Mi Flash Error: "Cannot find file flash_all_lock.bat"
The fastboot ROM was not unzipped correctly.