How to restore a JR site with the Database backup file only?
Installation and Configuration
pch:....If I understand you well, I should try to install a clean JR 6.1 site, add the JR 5.3.xx database backup to that JR 6.1 site (by completely deleting the JR 6.1 database and restoring the JR 5.3.xx database backup via phpMyadmin), then run the repair.php script. Right ?
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yes. This is the SECOND thing that I would try.
The FIRST thing that I would try would be to import the database into phpmyadmin without deleting the existing stuff. There are going to be no-anything there already, and its already there, so I'd try it while the option to try is there. Since your next thing to try would be deleting it anyhow, you're not loosing anything.