iPhone backup encryption with password cannot be disabled

Hi have backups which encrypted with passwords and i know the backup password, i can restore it. There is not any problem.

But i want to disable encrypting backup with password, here is the problem. In iTunes Encrypt "iPhone backup with password" checkbox is checked and disabled. So i cannot be able to change it.

Solution 1:

My phone had a Profile, which forces backups to be encrypted.

To enable unencrypted iPhone backups again, I removed any Profiles from my phone under Settings -> General -> Profiles.

Profiles can be either Provisioning or Configuration Profiles, and are used for iPhone development and by Enterprise Deployment tools. More information about profiles can be found in the Apple Enterprise Deployment Guide.