Igate | Gw020-h Firmware [better]

Technically yes, but not recommended. A Wi-Fi dropout mid-flash will brick the device. Always use wired Ethernet for updates.

Official firmware for the iGate GW020-H is typically managed and pushed remotely by the internet service provider (VNPT) via the management system. Igate Gw020-h Firmware

To use a secondary router, you must configure "Bridge Mode" within the WAN settings. Newer firmware (v.T002+) has a slightly different layout for this task. Technically yes, but not recommended

Some common aspects of firmware reports for gateway devices like the iGate GW020-H include: Igate Gw020-h Firmware