How to restore a JR site with the Database backup file only?
Installation and Configuration
There is no foolproof step by step guide for the situation you're in.
First thing I would try is adding the database to a 6.1 site, then running the repair.php script
Docs: "somethings wrong what do I do"
https://www.jamroom.net/the-jamroom-network/documentation/problems/114/somethings-wrong-what-do-i-do
It might work, might not.
Good thing is you have the backup and can try as many times as you like.
