Can you reverse VM hardware from 8 to 7?

The documentation says you can reverse the VM hardware from 8 back to 4, if you do a snapshot first.  See this URL:

http://pubs.vmware.com/vsphere-50/index.jsp?topic=%2Fcom.vmware.vsphere.upgrade.doc_50%2FGUID-A45CBEE5-C4D2-484E-A699-A5A577244DE0.html

But can you reverse the VM hardware from 8 to 7 using a snapshot?

If so how?

regards