If you don’t see an option to upload a file in the settings, your ISP has disabled manual flashing. They do this to ensure you don't install a generic TP-Link firmware that might break your VOIP settings or NBN configuration. How to Force an Update
If you suspect your firmware is outdated or you're experiencing bugs, try these steps: vx420-g2h v2 firmware
Firmware is essentially the "operating system" of your router. For the v2 hardware revision of the VX420-G2H, updates often target: If you don’t see an option to upload
If a firmware update fails halfway through, the router may "brick." If the power light is blinking orange and never turns green, you will likely need a replacement from your provider. Summary for v2 Owners For the v2 hardware revision of the VX420-G2H,
Protecting against newer WPA3 vulnerabilities.
Using a paperclip, hold the Reset button for 10 seconds. Note: This wipes your Wi-Fi passwords and settings, but it forces the modem to re-download the latest configuration and firmware from the ISP servers.
Power off the router for at least 30 seconds. When it reboots and reconnects to the ISP, it often checks for available "pushed" updates.