I has tested. Burn an image from focal on H3, then via dd command to make a new image from focal system of tf card. then burn new tf card from I make new image, this new tf card cannot start system. (Occur FDT_ERR_BADMAGIC error).
But, make a new image from buster system, all operations are same as the focal system. The new tf card burn from buster system image, it can normal start and use system.
Why??