RV50 Firmware upgrade failed, device unresponsive

I tried updating the FW to 4.12.0 OTA on two RV50 devices and both failed, and now the devices are unresponsive. The power LED comes on but no other LEDs light up ever. Factory reset doesn’t change this. Cannot connect via ACEmanager OTA, USB, or direct Ethernet, and cannot ping the devices.

Any suggestions? Thanks!

I have the same issue. So far, no answers and no resolution!