The default password for a TP-Link 5400 router is admin.
However, this password might have been changed by the previous user or network administrator.
If you cannot remember the password, you will need to reset the router to its factory settings. This will erase all your current settings, including the Wi-Fi password and any custom configurations.
To reset the router, locate the reset button on the back or bottom of the device. Use a pin or paperclip to press and hold the button for about 10 seconds.
Once the router is reset, you can access it using the default IP address (usually 192.168.0.1 or 192.168.1.1) and the default username and password (admin/admin). You can then configure the router to your liking.
