if you need stock firmware to unbrick and updates your Galaxy Note S4 this post will be very helpful to you
How to Upgrade and Flash galaxy S4 to Lollipop Click Me
Following this instruction on how to unbrick and upgrade your device from the link above we and the developer are not responsible for any damage to your Galaxy Note S4 so it wise to read post very well and understand each lines before flashing the stock firmware
Backup important files stored on your device before proceeding with the steps below, so that in case something goes wrong you’ll have backup of all your important files.
|Model name||GALAXY S4 LTE-A|
|Build date||Tue, 13 Oct 2015 07:13:31 +0000|