Q: forgot iphone restriction passcode, how do I recover or reset it

You will need to restore the device to factory settings. Use Restrictions on your iPhone, iPad, and iPod touch - Apple Support

From above article:

"If you lose or forget your Restrictions passcode, you'll need to erase your device and then set it up as a new device to remove the Restrictions passcode. Restoring the device using a backup won't remove the passcode."

-AJ