[helloooooooo]

If they are read only file systems it will disrupt any malware on the router. I’ve reversed routers whose file system only allows signed executables, and update packages. It’s good practice. I give the same advice to people and their phones, reboot regularly.

[Hikikomori]

Then it will get infected again pretty much right away no?

[kurikuri]

Unless the infector retargets the same router (i.e., the payload has to be redelivered), then no it won’t.