Keep the button depressed for 5+ seconds until the front LEDs form an alternating sequence.
: Found printed explicitly on your unique device tag. Step 2: Access the Interface aot4221sr firmware upgrade
If an update failed or the system operating environment becomes deeply corrupted, advanced technical users can flash firmware onto Sercomm chipsets utilizing dedicated software environments. How to upgrade the firmware of TP-Link 5G/4G Routers Keep the button depressed for 5+ seconds until
: A successful firmware upgrade typically streamlines the router's handling of DNS queries and firewall rules, which previously caused these "bottlenecks." Why the Upgrade Matters go to > Update Firmware .
Access your device settings menu to note your existing firmware version.
In the administration panel, go to > Update Firmware .