Hi Miguel,
Installing IBM via a LAN console can sometimes be tedious, especially when the console isn't detected the first time and you have to go through the 65+21 options, which should be done as a last resort.
First of all, it's advisable to have the latest version of ACS, to disable firewalls and antivirus software, and to disable wifi on the workstation that will be used as a console, and to connect directly via an RJ45 cable to the port that will be used for the LAN console. A good practice is to take port n°1 (the highest) of the network card furthest to the right on your server when you look at the back of your server and if it's rack-mountable.
Then, in the ACS management menu, click on System configuration. This will open a window with a "Locate Console" button.
Start the server in 01- D -M with the I_BASE DVD of the OS version you wish to install. When the SRC code C6004031 is displayed, the server is looking for a console. Click on the button, after a few second an IPV6 appears in the windows, select it and click
Only use functions 65+21 until you've waited about twenty minutes or more.
Unless I'm mistaken, the words 13 and 15 are on function 12 of the Panel. You can use this KB ACS Console Setup and Installation Using Default IP Address, don't forget to set IP in the same a range as the default IP console on your computer. You can look a the led on port of IBM network card if they blink there is good chance that you use the good port.
Regards