Open a web browser and type 192.168.1.1 or http://tplinkmodem.net into the address bar.
If the power light blinks continuously and the router continually restarts, the firmware may be corrupted. vx420-g2h v2 firmware
Never update firmware just for fun. Only update to solve a specific problem or add a required feature. Open a web browser and type 192
If your ISP customized the firmware, contact them, as they may have a proprietary update version. vx420-g2h v2 firmware
Sometimes adds new capabilities or improves the management interface. Crucial Note: Customized Firmware & Providers