This is a tough spot. End-of-life (EOL) means your ISP no longer supports the device. TP-Link also may have removed old firmware. Your only safe option is to replace the router. Using an EOL router with outdated firmware is a significant security risk. Consider purchasing a current-generation VDSL modem/router.
You downloaded the wrong hardware version or an ISP firmware for a different provider. Solution: tp-link vn020-f3 firmware download
What are you trying to fix (e.g., slow speeds, connectivity issues)? Download for VN020-F3 V1 - TP-Link This is a tough spot
However, because this device is often ISP-customized, finding the correct firmware can be slightly more complex than a standard retail router. because this device is often ISP-customized