If your current firmware allows it, save a backup of your configuration before starting.
Before updating, record your current firmware. This gives you a baseline and helps when contacting support. Update Software in ZTE ZXHN H267N
Occasional updates add advanced management tools or support for newer network protocols. Preparation: Before You Start The Complete Guide to Updating Software in ZTE
: It is highly recommended to back up your current configuration settings before starting the upgrade. Wired Connection Update Software in ZTE ZXHN H267N