So (I’m using TeraTerm) under Setup -> Serial Port, set the baud rate to match whatever you set it as in ROMMON. This MUST also match on the terminal program setting as well. You can set the baud rate in ROMMON using the set BAUD command. With a little trial and error, I found that the maximum baud rate I could set it up to work perfectly with was 57600. I tried this with baud set to 9600 and man, it seemed like it would take over 3 hours for the transfer to complete. Now the rate of transfer depends on the baud rate that you set for your console connection. This wonderful little thing is called Xmodem. There is, however, a method to transfer another IOS using a direct console connection with a PC (the transfer is over your console cable itself). Since the device is in ROMMON, there’s not much that you can do. I want to share how this can be used and I hope that this may be useful to others. Without much else to try, I decided to give Xmodem a shot. I bought a 3550 a while back and that is precisely what happened with me. There are times when the IOS on a switch may crash and (as a last resort) you need to use the painfully slow Xmodem transfer to save your life.