What are you trying to use? IF you're trying to use the RS232 to USB, unless you're lucky, I never found good luck with that. Find a direct USB adapter that bypasses the need for the serial RS232 connection, unless you have a legacy motherboard around! Once I flipped over to the USB to "whatever the style" phone jack it is, I was able to update the firmware for my hand controller and StarSense with little issue. (I ended up with that type of adapter when upgraded the wife's SyncScan hand controller for her Orion Atlas mount.)
Hope that helps.
David