@Vincent-TP 

I have a controller that I can't restore, I've tried on several devices with both windows and linux servers but it fails every time. It looks like all backups from 5.15.20.7 and up are corrupt. I've tried restoring other controllers and they've worked without a problem,

It's not critical now, but it could be if restore doesn't work when I need it.

I have a backup file here that is encrypted with winrar and registered email address as password and sendt to support@tp-link.com