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 use the internet from. 

I'm trying to use the box as an access point if I try to browset to 192.168.178.20 I get  "Firefox can’t establish a connection to the server at 192.168.178.20."

If I connect to the laptop directly, I get the same result. 

Clearly this is the wrong IP address for the c50 [I think it might be my laptop]

Any help in working out the IP address of this C50 would be appreciated. My other [new] C50 is sitting  at 192.168.178.50

Allan 

ipconfig gives me this when connected to TP-LINK_0500 

Ethernet adapter Ethernet:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :

Ethernet adapter Ethernet 2:

   Connection-specific DNS Suffix  . : fritz.box
   IPv4 Address. . . . . . . . . . . : 192.168.178.20
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Default Gateway . . . . . . . . . : 192.168.178.1

Ethernet adapter Ethernet 3:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :

Unknown adapter OpenVPN Data Channel Offload for Surfshark:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :

Wireless LAN adapter Local Area Connection* 1:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :

Wireless LAN adapter Local Area Connection* 2:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :

Wireless LAN adapter Wi-Fi:

   Connection-specific DNS Suffix  . :
   IPv4 Address. . . . . . . . . . . : 192.168.0.100
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Default Gateway . . . . . . . . . : 192.168.0.1

Mobile Broadband adapter Cellular:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :

PS C:\Users\allan> ping 192.168.178.20

Pinging 192.168.178.20 with 32 bytes of data:
Reply from 192.168.178.20: bytes=32 time<1ms TTL=128
Reply from 192.168.178.20: bytes=32 time<1ms TTL=128
Reply from 192.168.178.20: bytes=32 time<1ms TTL=128
Reply from 192.168.178.20: bytes=32 time<1ms TTL=128

Ping statistics for 192.168.178.20:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 0ms, Maximum = 0ms, Average = 0ms
PS C:\Users\allan>

If I try to go to