Is there a sure-fire way to reset a version 1 C50 I Really need help here - cannot see the V1 C50 on the LAN I have another (bought new ) v2 C50 Do I need to disconnect my other C50? That's at 192 l.1

I have recently bought this second-hand, though I have already bought a new one. I've reset it using the small black button on the back I have TP-LINK_0500 TP-LINK_0500_5G, which I can connect to and