Router uses another region's firmware after ISP setup

The most likely cause is that the ISP's technician loaded a firmware image from a different regional build (for example EU) onto a US-model router, either by mistake or because their provisioning system pushed the wrong file. 1. Log in to the router's admin page by typing http://tplinkwifi.net or the router's IP address (often 192.168.0.1) into a browser, then sign in with your admin password. 2. Go to Advanced, then System, then Firmware Upgrade, and note the current firmware version and region shown there. 3. Compare that to the model label on the bottom of the router. If the label says "US" but the firmware is listed for EU or another region, you have a mismatch. 4. Check TP-Link's official website for the Archer AX53 V1.0 US support page and download the current US firmware file. Do not use files from third-party sites. 5. Before changing anything, write down your current Wi-Fi name, password, and any custom settings, since a firmware change can reset them. 6. In the same Firmware Upgrade page, choose the downloaded US file and click Upgrade, keeping the router powered on and connected until it finishes and reboots. 7. Restore your settings, then confirm that internet speed and Wi-Fi channels work as expected. If the ISP needs a specific configuration, ask them what they require before reverting anything. I cannot confirm from this description whether the EU firmware actually causes problems on your network, and some ISPs deliberately use custom builds, so check with the ISP before flashing. If none of this works: contact TP-Link support with your model, hardware version, and firmware version, and ask the ISP installer's company to explain why a non-US build was installed.