I currently do not have OpenWRT working on this device. Attempts to install via the factory web interface have failed. I'll try to update as experimentation continues.
Hardware Notes
The UART interface appears to be the same configuration as the 2HP (double memory) version, but missing the pin headers. GND should be the pin on the left, and VCC should be on the right, marked with a small triangle.
Other side of board
The power supply is very different from the 2HP (which has active 802.3 compliant PoE). The 2H has passive PoE, which according to ALFA support, works from 5v-18v. However, it is recommended to supply 12v-18v if also using the USB interface.
Interesting that it's also labeled "Hornet-NHB".
Continuing the discussion from ALFA Tube 2HP Successful Installation and Notes: