When I was trying to backup restore between SharePoint DEV and QA Farms got this error message:
Restore-SPSite : <nativehr>0x80070003</nativehr><nativestack></nativestack>
The source and target SharePoint Farm's build version mismatch!
Solution: Upgrade either the source or destination SharePoint farm and then backup-restore.
What if you don't have the option of immediate upgrade and complete this backup restore operation? Here is the backdoor way to skip upgrades and backup-restore SharePoint sites or lists between farms with different versions/build numbers.
One way is: Backup-restore the content database of your old SharePoint site collection to the target farm. Mount and Upgrade the content database (Mount-SPContentDatabase followed by Upgrade-SPContentDatabase) in the target farm.
There is an another way: Binary Edit! Just open the backup file in any HEX editor tool, I've used HxD from: http://mh-nexus.de/en/hxd/ , and change the version build number to your target SharePoint farm version.
Try restoring the site collection again, It should work now.
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