I have the BIOS links for my routers in browser shortcuts, and today I clicked in my old DSL-N55U_D1 instead of XT8, by mistake. And I have seen there is a new firm for it after 4 years!!:
This was my first ASUS, and I used it for my first DSL, and for my first FFTH (it has gigabit WAN, DSL and USB 4G, 3 wan modes). The next one was XT8, so I have used n55U for many years.
I think it is something valuable to have security fixes for such an old router yet.
DSL-N55U D1 - Support
www.asus.com
This was my first ASUS, and I used it for my first DSL, and for my first FFTH (it has gigabit WAN, DSL and USB 4G, 3 wan modes). The next one was XT8, so I have used n55U for many years.
I think it is something valuable to have security fixes for such an old router yet.