OpenWRT firmware for Asus DSL-N14U B1

I have a problem with my router because the usb modem modality don't work with my internet key.
I have seen of this mod for firmware bat I don't find my router model (ASUS DSL-N14U-B1)

Can you help me plase?

Unsupported, and at least the xDSL modem functionality is unsupportable.

The developments have already try to develop a firmware for this router? Bat the firmware is unsupported?