After i resetting my modem last week, i cant access to internet anymore until now, except my bro, he can till connect through the modem's wifi, but mine(wired connected to modem with ethernet LAN cable) CAN'T connect!
The LAN's light is blinking abnormally which is very slow, and it doesnt allow me to access to 192.168.1.1? why? please help me out you guys cool

On your PC, when you connect your ethernet cable to your PC you should be able to see two lights at the port, one is green one is orange, the orange should be a steady orange while the green will move rapidly or slowly depending on the data transfer. So first check if the orange light is OK, if it's a steady orange then you cable is okay. (This step might be redundant but it's still the first thing you should check)

Next, did you configure a static IP or are you using DHCP? If you're using static IP then remove the static IP and enable DHCP, this should solve the problem. Else:-

Open command prompt and type ipconfig /all. Look for your LAN connection settings. Tell me what is the IP address, the subnet mask and the gateway IP.

Your IP should be 192.168.x.x while the subnet should be 255.255.255.0 and gateway IP 192.168.1.1 (I'm only assuming that you're using default DHCP address range.)

Im having same issue now. TM modem Lan 1 unifi blinking and i cant access internet. Tried reset port, unplug and plug back cable also same. Actually what when wrong yah huhu