Hi, Im trying to read and install by UART0 the uSD card image that i need. when im using the UART0 j3 port using putty, there is no problem but when i connect to the j2 uART0 WKUP, it returns me some strange characters. what would be possible wrong wit my cable? beaglebone is brand new.

Nothing, that’s normal operation, that port is only showing debug of the wkup domain which the firmware doesn’t really dump anything in its correct form