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en respuesta a: Anonymous

There are many things you can try, assuming you manually saved often while drafting, explore here
https://knowledge.autodesk.com/support/autocad/troubleshooting/caas/sfdcarticles/sfdcarticles/AutoCA...

and

https://knowledge.autodesk.com/support/autocad/learn-explore/caas/sfdcarticles/sfdcarticles/Understa...

After that, look for your daily backups of all of your files, which hopefully you do regularly over the last 4-weeks.