@re_do-y
Hi,
How fast is the speed supplied by your Internet provider?
As per official specification the Archer C54 V1 is equipped with a "10/100 Mbps WAN Port".
https://www.tp-link.com/bd/home-networking/wifi-router/archer-c54/#specifications
If we take into account some protocol overhead the maximum Internet speed that can be achieved via a 100 Mbps WAN port are about 95 Mbps.
This cannot be changed by a firmware update.
In case your Internet provider provides you speeds faster than 100 Mbps, then you would need a Wi-Fi router with a "Gigabit" WAN port to be able to use the full speed.