My Goodness !!!! This NOT a Gen5/Gen4 issue. This is a 5.0 ghz frequency issue. The HT2000w is a Modem first and primary, a Router (of sorts) as a secondary function and a Wifi source as a distant third. There are going to be issues with the 5 ghz band ... the very nature of 5 ghz is to have less "penetration" than the 2.4 band. In addition you have got a lot electronics packed into a one box and it does NOT have any external antennas that can be used and adjusted to change/alter the WiFi radiation pattern. Wifi routers like to be centrally located and they like to be elevated, things that are hard to do with an entire Modem. You are making a mountain of a molehill, Turn off the HT2000w "radios", connect a decent or better grade Router that has a radiation pattern and features that meet your needs and the issue will be behind you. For all we know you have a big refrigerator in the way or steel partition studding or any number of environmental issues that can be addressed or overcome with a router with external antennas and better configuration options. In the end there is no kind of firmware update that is going to give an antenna-less unit the same performance as a good router. . Turn off the radios, get a good router, problem solved.
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