Second, use other dwg version conversion tools (such as AcmeCADConverter) to convert it into R 14 version, and then open it with a higher version. Most of them can be solved, but some still can't.
Third, use domestic CAD software (such as watching CAD) to open, save, and then open in AutoCAD, and you can clean up the stamp information.
Fourthly, printing marks can be eliminated by replacing ACPLTAMP. Change the ARX file under the cad root directory to another name or delete it.
5. Save it as a DWT template file and save it back to DWG after opening it.