Recovery can be done via JBoot web recovery.
Push and hold the reset button and turn on the power.
Wait until LED start blinking (~10sec.)
Upload
...factory.bin image via JBOOT http (
IP: 192.168.123.254)
If http doesn't work, it can be done with curl command: curl -F FN=@XXXXX.bin http://192.168.123.254/upg where XXXXX.bin is the name of the firmware file.