My advice is to keep the original firmware. I did the mistake to upgrade to the newer version with TrendMicro (available through the firmware upgrade option in the router's configuration interface), got problems of the router disconnecting clients randomly complaining of "DoS flooding attacks" of various types - all are false alarms of course. Only solution to the problem is said to attempt a factory reset, which is what I'm trying now. Unsure if it is even possible to downgrade to the original "non TrendMicro" FW version.