You can simply do a Google search for your router using the model number.
If you have one for brands below just click on the link and search the model number there.
- For DLINK - https://support.dlink.ca/
- For Linksys - https://www.linksys.com/ca/linksys-support/
- For TPLink - https://www.tp-link.com/ca/support/download/
- For Netgear - https://www.netgear.com/support/
- For Eero - https://support.eero.com/hc/en-us