Can't communicate to Digi WR44RR flashing LED

I was doing flashwriter then suddenly show tftp failed so i reset the transport Digi then suddenly flashing LED at the front looks like the file im uploading was corrupted.
Is there a way to communicate to Digi WR44RR if you lose the connectivity through Ethernet port and i dont have a serial cable . Is there physical reset button to factory default instead of sending back to RMA.

Thanks in Advance…

Any method to recover a TransPort device beyond that will at least require the serial cable.