Anygate RG5300R Korean brand router, while I update its firmware with same brand different model firmware then it has not any response. I tried many reset option like 30/30/30 but cant establish any response (ping) from its Ethernet. I also tried tftp2 for firmware push but failed. Finally I decide to step through Serial connector with Hypertrm . in this regard, I collect Prolific 2303 usb to serial cable to connect.

But I cant recognize Serial TX, RX and GND point. Please...  help me to detect TX , RX, GND from uploaded image and also few instruction about Hyperterminal or similar Application because I am beginner of this software.
Thanks and grateful in advance. BTW Sorry for my poor english.

(Last edited by Hasnat_BD on 12 Oct 2014, 16:34)