Migrating a TFS with a partially installed SP1

Here's a problem i faced a few days ago,
I was migrating a TFS which was supposedly upgraded to SP1 to a new TFS server.
Since the source data tier and application tier were in the SP1 version of the TFS, I installed a new TFS server and upgraded it to SP1.
After that I went through all the normal procedure of moving the database to the new server.
After I finished that stage I checked the team explorer to see that everything is working.
When i tried to open the source control explorer I got this error-
"TF53018: The application tier [SERVER] is attempting to connect to a data tier with an incompatible version."
The first thing I did at that stage was what I always do when I run into serious problems- I went for coffee.
The second was looking for answers in Google.
What I found was this post which mostly talked about the beta version of the SP1, but it gave me some pointers. Checking the database tables I found this value:
TfsVersionControl database -> tbl_Repository table -> Row 1 -> SchemaVersion: 8.50727.138.
I checked out the server assemblies. Looking at- Microsoft.TeamFoundation.VersionControl.Server.dll, I saw that the version number was 8.50727.762.
I found out that the inconsistency here was the result of a bad update to SP1 in the original TFS. The database where I took the data from was not updated entirely to the SP1 version and that's why I ran into this issue.
What solved the problem was updating the target TFS server again, after the migration, to the SP1. See this post about SP1 setup.