Hello,
This is most probably the same issue as here Checksums do not match - #82 by zvin
Your image was flashed correctly but something wrote some files to the drive before the validation completed, changing its checksum.
To check that the issue is not with your sd card / drive, you can try flashing the same image from a Linux or macOS computer.
We have an issue open for that Lock the drive to prevent failure on verification · Issue #3197 · balena-io/etcher · GitHub
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