Whenever I try to restore the backup after editing it, I get an error message on the iPad that states that the backup failed. The problem however is that whenever I try to do this on the iPad, which runs iOS 10, it does not work. Since my dad knows that I did this, I figured that the easy thing to do would be to pull this trick again, so I tried it. When I was still in school, I was able to remove the MDM restriction that was on my school-issued iPad running iOS 9 by using iBackupBot and the instructions here.
The problem is that my dad now wants to remove the MDM and let her iPad be unrestricted since he now feels she is old enough for it, but for whatever reason, he cannot access whatever he needs to in order to remove the MDM. My dad set up MDM on my sister's iPad as a means of parental control.
