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R9000 5 yo router isn't seen my Mac Mini M2 in 5G unless I slow down speed from 1700 to 800
I thought I had a bad Mac at first as it just wouldn't find my 5G network so was stuck on 2.4G. Then I noticed it could see my neighbors 5G. I tried everything; changing channels, renaming the netw...
If your not really using the higher speeds or have lots of devices using it, i'd keep what you have configured so the mini will work. At some point the 9000 will need to be retired and find you something that has 6E or even WiFi 7.
If all other devices are working with 160Mhz enabled and this one is not, would point to something this one device is not working right or is not supporting of.
You could try installing some 3rd party FW on the router to see if the may help or not:
https://www.snbforums.com/forums/netgear-ac-wireless-wi-fi-5.53/
Give Voxel's a try. You can revert back to stock at any time.
Trying to find a configuration to reliably transmit/receive 5G Wi-Fi over a 160 MHz wide channel can be elusive. Much depends on how crowded your radio frequency environment is and your access to DFS channels.
For some background reading, check out chapter 14 of the Duckware document here:
https://www.duckware.com/tech/wifi-in-the-us.html