The error happens when the Mi Flash Tool cannot locate the required script to flash your Xiaomi, Redmi, or POCO phone. This usually occurs because of an incorrect file path, a missing folder extraction, or selecting the wrong flashing option at the bottom of the tool.
Before diving into the fixes, it's helpful to understand what this file actually does. In a standard Xiaomi Fastboot ROM (which is a .tgz file), you'll find a set of .bat script files that control the flashing process. These are located in the main folder after you unzip the ROM package. The file 'flash_all_lock.bat' is specifically designed to . Essentially, it's the script for a full, "factory-fresh" reset that also reinstates the bootloader lock.
Which (Clean all, Save user data, or Clean all and lock) do you want to use?
Mi Flash Tool requires a specific folder structure. If you extract the ROM into a subfolder inside the images folder, the batch file might sit one level too deep. mi flash error cannot find file flashalllockbat
logs. The tool wasn't looking for the file in the folder he selected; it was looking for it in a nonexistent subdirectory. He realized he had unzipped the firmware "cleanly," but the Mi Flash Tool expected a specific architecture.
If you want, say “I’ll share the ROM filename and a folder screenshot” and I’ll point out the next step.
By doing this, you've manually provided the missing script that Mi Flash Tool is looking for. This file is essentially the same as flash_all.bat , except it includes a command to re-lock the bootloader at the end. The error happens when the Mi Flash Tool
Download the Fastboot ROM .tgz again from a reliable mirror.
By default, newer versions of Mi Flash select automatically. If you download a specific region's firmware or an incomplete archive that lacks the script to lock the bootloader, the tool throws a "cannot find file" error because it cannot execute the required script.
A proper Xiaomi Fastboot ROM folder directory looks like this: In a standard Xiaomi Fastboot ROM (which is a
“I tried to flash my Redmi Note 10 Pro (sweet) from MIUI 13 to 14. Mi Flash Tool kept saying ‘cannot find file flash_all_lock.bat’. I downloaded three times from different sites. Finally, I opened the ROM folder and saw that ‘flash_all_lock.bat’ was not there. I copied it from an old MIUI 12 ROM for the same device. The flash worked, but my phone entered a bootloop because anti-rollback was triggered. I had to reflash with ‘clean all’ mode to recover.”
The error "cannot find file flash_all_lock.bat" appears when the Mi Flash Tool is instructed to flash, but it cannot find the flash_all_lock.bat file in the selected directory, or the file is missing/corrupted in the ROM package you downloaded. Causes of the flash_all_lock.bat Error
—he could see it in the folder—but the software was blind to it. He started the ritual. First, the path check