anyway, if you think it is port fault, please open a support case. support team can proceed rma if it is hardware issue indeed.
Creating a Bootable USB Thumbdrive:
If you are on certain versions and the AoM baud rate does not match the baud rate of the appliance you can have issues:
Yes I am using the brand new appliance. And the cable i am using is an extreme DB9 console cable. Not the one in the box.
Is it mandate to use the F5 cable for this.? and i have tried different baud rates as well.
SOL587 - Pinouts for serial terminal cables used to connect the 9-pin serial port on F5 products
Make sure your terminal settings agree with the 1600's settings.. You can check them from the lcd screen. Someone may have changed them previously.