Fojkfsdk Sdfsdfsdf :
so i connected a tp-link router to my modem through an Ethernet cable and every since then my isp modem 192.168.1.1 user interface has turned into the tp-link user interface i can't get rid of it even with factory reset after i disconnected the tp-link any help would be appreciated since the isp won't help me if the problem is caused by me :/
Normally a modem with an interface of 192.168.1.1 is actually a modem + router (does it have multiple LAN ports and/or wifi?).
If that's the case, you should configure the TP-Link to
work as an access point and change the LAN IP address to something outside of the DHCP range. For most TP-Links, 192.168.1.10 should work.
If for some reason you want to maintain a two-router configuration (double NAT), then you would need to change the the LAN IP address of the TP-Link to a subnet different from the modem (or vice versa). E.g. 192.168.2.1