"Missmatching image and device" while flashing using fastboot

If you are trying to flash a fastboot ROM on a Xiaomi device and get stopped by the "Missmatching image and device" error, your flashing script will abort before touching a single partition. This safety check is designed to prevent users from flashing the wrong firmware, but it often triggers incorrectly on regional variants of the same hardware.

I ran into this exact wall while flashing a Redmi Note 8 Pro (India variant) from Linux using Xiaomi’s flash.sh script. Even though I knew the firmware was correct for my hardware family, the script refused to proceed. Here is the exact output from the terminal:

Missmatching image and device

This is not a broken fastboot environment, a driver issue, or an Anti-Rollback (ARB) block. It is a strict sanity check baked directly into Xiaomi's flashing scripts (flash.sh for Linux/macOS, or the .bat files for Windows).

Before making any changes, I ran a basic fastboot check to see how the phone identified itself:

fastboot getvar product
product: begoniain

fastboot getvar vendorcountry
vendorcountry: begoniain

The device clearly identifies itself as begoniain. However, inside the extracted fastboot ROM, the flash.sh script contained this logic right after the ARB check:

fastboot $* getvar product 2>&1 | grep "^product: begonia"
if [ $? -ne 0 ] ; then
echo "Missmatching image and device"
exit 1
fi

The problem: The script was hard-coded to expect product: begonia (the global variant). Because my device reported begoniain, the grep command failed to find an exact match, returning a non-zero exit code and forcing the script to bail out. The script treats region variants as completely wrong devices.

Step-by-Step Guide: Modifying the Flash Script

Step 1: Open the script in a text editor

Navigate to your extracted fastboot ROM folder and open flash.sh (or your respective .bat file if you are on Windows).

Step 2: Locate the product check

Find the block of code using grep to check the fastboot getvar product output. It usually appears near the top of the file.

Step 3: Edit the validation logic

You have two ways to handle this. I highly recommend Option 1 for safety.

Option 1: Whitelist your specific variant (Recommended)

Modify the script to accept both the global codename and your specific regional codename. For my Redmi Note 8 Pro, I replaced the original block with this:

fastboot $* getvar product 2>&1 | grep -q "^product: begoniain" ||

fastboot $* getvar product 2>&1 | grep -q "^product: begonia"
if [ $? -ne 0 ] ; then
echo "Missmatching image and device"
exit 1
fi

Note: Replace begoniain and begonia with your device's specific codenames.

Option 2: Nuke the check entirely (Dangerous)

If you are 100% certain you have the right ROM for your hardware and accept the risk of bricking, you can simply comment out the entire validation block using #:

# fastboot $* getvar product 2>&1 | grep "^product: begonia"

if [ $? -ne 0 ] ; then
echo "Missmatching image and device"
exit 1
fi

Warning: Once you remove this, the tool will attempt to flash this ROM to ANY device plugged in. You own the brick if you make a mistake here.

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Verification and Important Warnings

After saving the modified flash.sh file, I re-ran the script using sudo ./flash.sh. The script bypassed the error and successfully flashed the partitions.

Before you do this, keep these guardrails in mind:

• Check your codename first: Always run fastboot getvar product. If the output is completely different from the ROM you downloaded (e.g., trying to flash a sweet ROM on a begonia device), stop immediately.
• Region still matters: While begonia and begoniain share hardware, flashing a mismatched region can sometimes lead to broken modems or no cell signal.
• Anti-Rollback is separate: The ARB check is a different safety net. If your device ARB version is higher than the ROM’s anti_version.txt, forcing a downgrade will hard-brick your phone.

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The "Missmatching image and device" error is often just a regional naming discrepancy in Xiaomi's scripts. By manually editing the validation logic in flash.sh or flash_all.bat, you can bypass this hurdle and restore your device. Always double-check your codename before proceeding to avoid a permanent brick.

Did this fix your flashing issue? Let us know which device you were working on in the comments below, or share any other fastboot tips you've discovered!