It is critical that nothing interferes with the firmware upload process. Disconnecting the power or serial connection during the upload could leave your radio in an unusable state that can only be corrected at the factory.
CDR-9150XL Radio Family
Radio Configuration Utility Location Code Relay Mode Forwarding Radio Modes Jump Tables
Navigation Planning Utility Panels Optimization Protocol Memory Map Signal Strengths OSS Foundations
Firmware
On occasion, Coyote DataCom 
releases new firmware for the radios to add new features or correct errors. Click on the firmware icon to invoke the firmware panel.
Simply connect to the internet in the usual way, and then click the "Check Internet for Updates" button on the firmware panel to download whatever updates may have been published since your radio was shipped.
The list is sorted from newest to oldest. A radio tower icon will display next to the firmware version present on your radio. If this is not the first version shown, then select the first version and click the Upload… button to load the firmware in the radio's Flash memory.
Warning:Although it is possible to upload older versions of the firmware to the radio, this is not recommended. Please use only the most recent version of the firmware.
There is an "Open..." button at the bottom right corner of the panel. Click this button to open an archive (.zip) file of firmware revisions. Coyote DataCom does not generally distribute firmware archives, but may do so to provide custom features or experimental releases.