snertos, maybe the best advice to regain full control over your website is to perfom the migration on your localhost. Here's the theory part:
1. Use your clean old backup to create your website on your own computer.
2. Upgrade all the way from v6.01.11 to v6.01.19. The upgrade procedure is very simple, don't be afraid.
3. Use the latest full v7 core to upgrade your v6 website. You will be doing this on your computer so, again, don't worry. Perform the upgrade exactly as written in the readme file, step by step.
Once your upgraded website is functional you will be able to back it up and restore it on your webhost.
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