The most common mistake is running the MSM Download Tool from your "Downloads" folder while the firmware files reside elsewhere. Locate your downloaded stock ROM package.
Windows has a 260-character path limit. If your firmware folder is buried deep inside nested folders (e.g., C:\Users\Name\Downloads\Firmware\Realme\Update\Files\Tool\ ), the MSM tool will fail to read the package. flash package does not exist msm download tool exclusive