I should have known that I had to upgrade first to 2.0, but at the time I didn't...
So here it goes, I used to have a WP blog version 1.5.2. I tried to directly upgrade it to version 2.2.1. I made a backup of my WP directory. After my 2 first failed upgrade tries, I recovered my blog (with original version). But I tried once more to upload the new files and make a last attempt to upgrade. But it failed again, and now after cleaning my WP directory and having copied the backup files, I can't recover my blog. Instead, WP invites me for a new installation. Even though my database is still in place, under phpmyadmin, I can see my wp_etc... tables.
Does anybody know how I could bypass the installation and recover my original version?
thx for your time.