I have a C8 router and use port forwarding. I did have an issue with port forwarding after I upgraded the firmware with the green GUI on the C8. After working with TP-Link support, I ended up going back to the old firmware with the Blue GUI.

You need to setup the ports up in the virtual servers list and the the reserved IP address in the Address Reservations.

Thank you for reply i did what you said but it still don't work should i upgrade to the green ui?

i have this problem too

and one thing how can i get my reserved ip adress?

When you connect to the router, an IP address is assigned to the device such as 192.168.0.119. Every device has a MAC address which most times is printed somewhere on the device. What you want is to use the same device IP address for your device every time you sign on so it can use an assigned to a port.
IP addresses are assigned by the router. If you sign on to your router's basic page, and click on the wireless it should give you a list of the assigned IP address and the MAC address for each connected device.
The first part of the IP address is the same as your router (most are 192.168.0 or 192.168.1). The last three digits identify each connected device. Some routers have a control range for connected devices. Select a unused higher address. I use 119 through 129. Add an entry in the reservation address table using the MAC address and the selected IP address.
Restart your router and our device should connect using the new selected IP address.
Now you have an IP address that you can assign to a port on the Virtual Server page. For my cameras I use port numbers 81-89. Not sure what port you need for your device.
I generally backup the router prior to making changes and restart the router after each change. When things are working, backup again.

yep i did that. still don't work

Does your device support UPnP and is it turned on? If so, do you see them in the router settings?
I just looked up and it appears you will be using port 25565.
You may need to set up static routing https://portforward.com/networking/staticip.htm