LCD4 and RS232 cape conflict

I try to use LCD4 cape and RS232 cape together but it conflict with UART2 port. Then I google the problem and find this blog ( They modify the device file and change RS232 port to uart1. But it does not working for me( or LCD4). When I did everything and reboot BBB, the ttyO2 is still there. And RS232 and LCD4 is still conflict.

I try both ubuntu and Angstrom. Both are not working

Anyone has reply???