For context, I am attempting to resolve a connectivity stability issue, and I suspect a firmware flash is required.
There are three methods to perform the update. Method A (USB) is recommended.
turn off your router or disconnect the cable during this process. The router will usually reboot automatically once finished. Pro-Tip: After the Update
To help you find the exact file, do you know if your router was provided by a specific ISP like Firmware 6.3.4 - Lucom
After reboot, check sysinfo for: Firmware: 4.2.1b Self-test: PASS GN drift: < 0.02%
If you are looking for a manual download link for the WLTFSM-146GN firmware, you likely won't find one publicly. This module is a component usually found inside LG smart appliances (typically washing machines). The firmware is almost exclusively delivered Over-the-Air (OTA) via the LG ThinQ app.