Issue: I can not find my router in menuconfig
Root causes:
Some platforms don't offer specialized single targets per router because most routers use almost the same configuration and do not require special packages for USB, ethernet or wireless.
Your device is not supported by OpenWrt
Solutions:
Selecting the default generic target will build images for all single targets. Examples: Ralink/Mediatek (ramips) devices
Add OpenWrt support for your new device