Issue with Ubuntu image

I tried to clone from SD to image file. After that I copied from image file to SD again. The process did ok. But the New SD image has issues when running. I saw a different checksum between original disk and the New one. The image is a NanoPi image. Any Idea?

Is it is file-based checksum? If it is a block-based checksum, I imagine it would change. A file-based checksum should be the same.

What were the issues you had when running the new image?


I can see many strange chars.