Hello,
Thank you for contacting us.
I would like to inform you that you can upload configuration backup files to your device if they were generated on an identical device using the same or an older firmware version.
If you try to upload a backup to a device with a different hardware version or from newer firmware, you will receive an incompatible backup file error.
In order to solve this issue, please try to upgrade the device firmware to the same in which the backup was created and check if this solves the issue.
Best regards,
Sigitas K.