Here's an update with a new problem...
I consoled into the unit and issued the erase startup-config to wipe the configuration.
I was then able to send the configuration file via hyper-term over xmodem. Everything appears fine, except now, I can't log into the unit without going through bootstrap mode. I've tried going into bootstrap mode and resetting the passwords, but the changes don't save. I can't log into the unit with the new configuration.
Any assistance on this would be greatly appreciated.
I found the problem as to why I was unable to log in via the console after updating the config file. There was a console password set that I was unaware of. I used the bootstrap mode to reset this password, and all is good now.