You need an internet connection to finish wget process successfully and then write the file to the desired partition. I have no clue about this specific device to recover. The only advice I can give is to try to start the process from the beginning and to make sure the device has an internet connection. Beside that v17 is quite old and not upgradeable. There are better methods:
If you have a look into the link I gave you you can see that the @hondabeat using USBtoTTL. So I would assume this is possible. And I would say that TTL is the only option left in this case. But I don't really know if there are other (easier) ways available. If you need specific help on using TTL in connection with this device you have either wait until others will look into this thread or try to post within the thread I've linked.