The Archer C9 v1 is not safe to run on 8+ year firmware due to security risks, performance issues, compatibility with new technologies, and manufacturer support issues. Firmware updates often address vulnerabilities, so running outdated firmware may expose the device to known threats. Additionally, outdated firmware may limit the router's ability to function optimally with newer technology. It is recommended to update the firmware to the latest stable version available from the manufacturer's website, ensuring compatibility with the new firmware version.

  @pisowifi100001 

Hi - many thanks for reply but 8 years old firware is the latest available from TP-Link for this router :-(

@Digiteeruk Please check TP-Link End of Life Products
Your router is long past EOL so, no, it not safe to use.