Reset Forgotten Restrictions Passcode (Updated For 2017)
You can still make use of iBackupBot to reset the restrictions passcode. Before you would just reset the restrictions passcode by inserting a line of code, however since that no longer works you have to find the encrypted version of the restrictions passcode and decrypt it using a website (http://ios7hash.derson.us/).

Here's the source and step-by-step procedure - https://www.techbout.com/reset-restrictions-passcode-iphone-ipad-ipod-8365/