For the searching and upgrading you can use special tool - Remote upgrade tool (for Windows).
You can download this tool via link.
Firmware files you can find here: link.
Firmware upgrade
1. Download and unpack Remote upgrade tool to any folder.
2. Download firmware file for your device.
3. Run Remote Upgrade Tool”, press “Select” and select needed firmware file.
4. Choose needed device from the search list (via logical or IP address), then match checkbox "Auto Reboot" and press " Upgrade"
If everything's fine, then you'll get message “Success”.
DO NOT TURN OFF THE POWER OR INTERRUPT THE FIRMWARE UPDATE, IT MAY CAUSE DAMAGE TO THE DEVICE.
