This is a good read, even if you are running a router other than the LinkSys.
I’ve done this to all my routers.
Linksys Tells Customers How to Remove CIA Surveillance Tools – Bitsonline
Network equipment maker Linksys has issued an advisory based on the latest Wikileaks ‘Vault 7’ releases. The advisory warns customers of a CIA firmware implant called ‘CherryBlossom’ that has reportedly infected the company’s older routers. Also read: Bitcoin Miner Support for SegWit2x Hits 90% – Scaling Resolution At Last?