before upgrade (Please do in 2.7 or earlier) Create a course. Enrol a few students in the course Go to the gradebook Go to "Full view" Create a category Create a grade item in the new category. Change the grade max to be something different to 100. This is important in 2.8 and higher because it changes the category total to change. Edit the category total calculation and enter in a forumlar of some sort. Update the category maximum to be something different to 100 and the minimum to be something different to 0. (this will only work in 27 and lower versions) Go to the grade report and give some students a grade for the grade item in the category. Go to the user report and view the grades of the students. Take a screen shot for a comparison later. Upgrade Upgrade your code to the most recent patch Go to the gradebook and check that there is no warning message. Verify the grades did not change during the upgrade 2.8 upgrade. Create a 2.8 instance from the weekly version 47cbd1b42da432ce3da1beadfaac4b5d4e1e23f7. (Last weeks stable release) Follow all of the "before upgrade" steps above to create a grade category with a maximum different to 100. Go to the user report and view the grades of the students. Take a screen shot for a comparison later. Run the upgrade and then check the gradebook. This time there should be a warning. Verify the grades did not change during the upgrade Accept the warning Verify the grades did change, because the max grade for the category is now correct.