Tried to upgrade to wp 3.2 but failed due to wrong MySQL version

Hello

I am new here so please forgive me if this has been answered earlier.

Here’s the problem:

I run 12 blogs on a dedicated server, along with many other websites.

Last week I signed up for an account on a site where can manage all my blogs from one screen, including upgrades etc.

Earlier this week I was notified that a new WP version was ready. Since I usually have no problems upgrading WP in the admins of the blogs I let the system perform the upgrades on the blogs – however I was not aware that WP 3.2 required MySQL 5.

Now I can’t access the admins of the blogs because the MySQL version is wrong.

My webhost is willing to upgrade MySQL, but if I do that I feel pretty sure some or all of my other applications (autoresponder, tracking software, rotator, ad management software, etc. will break or not work as they should.

So I want to revert the installation of WP 3.2 back to WP 3.1.x

My question is this:

Can I simply upload all the WP 3.1.x files to the domains?

Or do I also have to restore the blog databases?

Is there a tutorial somewhere for this (how to revert)?

Thanks in advance for your help.

Marvin
(Copenhagen, Denmark)