OpenWrt support for Netis N6 router

Need openwrt os for Netis N6 router

Who doesn't.

Same device?
https://fccid.io/T58N6TR/

Using zoom pdf at the fccid.io site I could barely make out that it has Mediatek chips.
This site suggests that it is MT7621 based:
https://www.speedguide.net/routers/netis-n6-ax1800-dual-band-gigabit-wi-fi-6-router-4791

It potentially is doable and there are 2 Netis MT7621AT devices already in the data base. If you are lucky you may just need to update the wifi modules and the partition scheme: 16MB for the N6 vs 128MB for the other devices.