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Re:FBI Is Wrong: All Routers Need to Be Reset, What to Do by jsiepkes on Tuesday May 29, 2018 @05:49PM (#17183164)
Probably from that the FBI previously said a reboot of your router was enough. Apparently it isn't.
Re:FBI Is Wrong: All Routers Need to Be Reset, What to Do by rdiddly on Tuesday May 29, 2018 @09:03PM (#17184127)
Rebooting is enough to get rid of stages 2 and 3, if present. To get rid of stage 1, you have to factory reset, and preferably overwrite the firmware too, even if it's already up-to-date.

More helpful than TFA or the FBI's announcements was this blog post, already featured on HN at least once and linked by commenters probably multiple times:

https://blog.talosintelligence.com/2018/05/VPNFilter.html