Funny you touch the subject. Yesterday I installed dd-wrt, many functions, wonderful but I could not put wifi to work 100%, always with low speeds. Then I went back to the original firmware and it is 100% my wifi, I made all the updates through the GUI, starting directly from 1.09 to 1.20 and then I did the 30/30/30 reset, wifi working well.
Until then I used the router without the modem of the operator, used the VLAN 600 but now I am testing with the modem of the operator (POWEBOX SEAGECOM), apparently it is more stable.
Before the dir-890 was doing PPPOE on the VLAN 600. Now I'm testing with the modem of the internet carrier and the dlink receiving the signal through DHCP.
A pity that now who manages my network is sagencom 2764 (terrible equipment, blocked by the internet operator) but still, it seems to be more stable than the dlink doing the pppoe on vlan 600.
It would be wonderful if the original firmware had at least 1/3 of the dd-wrt functions. The fact that you can make vlans on each door is sensational. Advertising blocker and other wonderful functions. It would be great to have a high-end router for enthusiasts who already came with advanced features in the original firmware.