Hello,
What power supply did you use to power your RUT device?
Are you able to find router's SSID, when scanning for available WiFi networks?
Please try device recovery via bootloader menu, as described here. Keep in mind, that, as described in Bootloader menu section, the design of the WebUI indicates, which firmware version can be uploaded.
If the procedure does not help, return the device for warranty repair or replacement.
Best regards,