ZyXEL NWA50AX installation failure

Hardware Questions and Recommendations
6

Sure.

  1. Powered on the device with stock firmware.
  2. Selected to update firmware
  3. Uploaded openwrt-ramips-mt7621-zyxel_nwa50ax-squashfs-factory.bin which I found from this thread Porting to ZyXEL NWA50AX
  4. Left the device in an 'Uploading firmware' state until light turned solid green

At that point there was no more AP, ethernet connection, and seemingly serial console.