Restrictions passcode
Unable to remember the restrictions passcode
unable to download apps or iCloud
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If you cannot remember your restrictions passcode, you will have to restore the device as new in iTunes to remove it, as explained in the document in your post’s title:
“If you forget your Restrictions passcode, you need to erase your device, then set it up as a new device to remove the Restrictions passcode. Restoring your device using a backup won't remove the Restrictions passcode.”