I have had this loss of ethernet network ports now on the TWO different Archer GX90 wifi units, both were brand new. Both started doing this within 1-2 days of use where the 3 ethernet network ports o

I upgraded the firmware on my router and I am all happy just to find out it cut my internet speeds in half. THIS IS EXTREMELY FRUSTRATING. How do I downgrade the firmware on this? This is ridiculous,