Before hunting for an update, you must identify your device specifications. Look under the battery or on the sticker for:

Updates can add functionalities such as:

Handles 4G LTE/3G signals via AT commands (e.g., at+cfun=1,1 for rebooting) and supports band locking or SMS management.

There are generally three ways to handle a firmware update for these devices: UZ801 - MSM8916 LTE 4G WiFi Dongle · GitHub