Migrating from Jahia 4.0.7 to Jahia 4.1.1

Hello,

last week I upgraded our TEST server from Jahia 4.0.5 to 4.0.7_01 
using the upgrade script found at 
http://www.jahia.net/jahia/page584.html. After a few days of testing 
we decided to install version 4.0.7_01 on our production server also. 
I installed it and it works fine on both servers now.

Yesterday I tried to upgrade our TEST server from 4.0.7_01 to 4.1.1 
using a migration script. It didn't work because the script only 
works with version 4.0.6. What can I do now? Am I stuck with version 
4.0.7_01? Or can you provide us with a new script to upgrade from 
4.0.7_01 to 4.1.1?

Another solution would be to go back to version 4.0.5 and then 
upgrade to 4.0.6 and to 4.1.1. I saved a copy of our 4.0.5 
installation files but if I have to restore the database (MS SQL) to 
the state it was before the upgrade I will lose one week of work.

Do I have to restore the database if I go back from version 4.0.7_01 
to version 4.0.5?

Thanks in advance for your help,
Pierre Lemieux, bibliothèque de l'Université Laval