This is going to be a quick one.
Remember ZSUN Wifi Card reader? It seems that there’s a new device that does the same thing. In fact it does look like a clone:
I just bought one of these from a Chinese supplier. It costed $7.5 USD and it does exactly the same. Using NMAP to scan for open ports I get the same results. So it was not surprising when I got access to it using the very same password “zsun1188”.
In order for you to flash the existing firmware you need to edit /etc/producttype and replace the A50 for SD100. The rest of the process should be pretty straight forward.
Enjoy your dirt cheap new router 🙂