I think you are a bit confused here, -f is ONLY for Realtek devices when E-S1 and E-S2 are not generated within the same second, or within a few seconds of the Nonce. All -f does is it runs all the possible seeds through the PRNG (seeds in this specific case are time in seconds since Epoch). -f is NOT a solution to any router, ONLY Realtek when E-S1 and E-S2 are not generated the same second, or within a few seconds of the Nonce. In the database, "No" means that the specified AP is NOT currently vulnerable to the Pixie Dust attack.