Please review notes in BOLD & RED in below descriptions.
Firmware instructions MUST be followed so your machine is not disabled permanently during the upgrade process. 

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ULTRA NVR Firmware
➡️ Download Network Setup Instructions for ALL below NVRs Here


UN2A Series
UN2A-32
UN2A-64
UN2A-64A

Firmware Update: Version 4.21.005 (Build 190703)
Please upgrade from Version 4.1.64
IMPORTANT: When upgrading anything beyond Version 4.1.70 we HIGHLY SUGGEST doing the upgrade at the machine and NOT over the network. If you attempt to upgrade over the network there is a chance your machine will crash and become completely unusable. Please upgrade ONLY at the machine. 
Download Firmware Here

Firmware Update: Version 4.1.64 (Build 190130)
Please upgrade from Version 4.1.70 
(v4.1.64 build 190130 is the latest firmware even though v4.1.70 build 181210 is a "higher number" the build date is newer. v4.1.64 build 190130 fixes a bug within v4.1.70 (can't view on IE using the WAN IP) So in order to update to the latest version you will have to have v3.4.96 then upgrade to v4.1.70 then upgrade to v4.1.64 build 190130)
Download Firmware Here

Firmware Update: Version 4.1.70 (Build 181210)
Please Upgrade from Version 3.4.96
Download Firmware Here
 
UN2A-128

Firmware Update: Version 4.1.64 (Build 190130)
Please upgrade from Version 4.1.70 
(v4.1.64 build 190130 is the latest firmware even though v4.1.70 build 181210 is a "higher number" the build date is newer. v4.1.64 build 190130 fixes a bug within v4.1.70 (can't view on IE using the WAN IP) So in order to update to the latest version you will have to have v3.4.96 then upgrade to v4.1.70 then upgrade to v4.1.64 build 190130)
Download Firmware Here

Firmware Update: Version 4.1.70 (Build 181210)
Please Upgrade from Version 3.4.96
Download Firmware Here