Dev environment for Prestashop (OVH web provider) always redirect to “old” installation

I have:

Created an A entry in my DNS configuration for dev.mysite.fr on my hosting interface
duplicated www to www2 and make dev.mysite.fr to point to www2 (I made sure of it by first putting a dummy .html file in it and noticed that it was indeed redirecting to it).
duplicated the database and make the new installation point to it (changing the /www2/app/config/parameters.php file)
deleted all the cache of the Prestashop in /www2/app/cache and in my browser
Updated all the url values in all the tables
Deleted the htaccess file
Despite all this, when I type dev.mysite.fr in my browser it still redirect to mysite.fr. I am suspecting that my web host redirects to it because maybe there are some errors on dev.mysite.fr

Any ideas ?

Thanks a lot


mysite.fr


Sorry, no clue about the real site.