My cell (only) continues to show me that there is a Firmware update available, but after 20+ attempts, the updates continuously fail. I've replaced the batteries in the keypad and unplugged the base as other posts had suggested, but still unable to update.  When I try to update through the key

My cell (only) continues to show me that there is a Firmware update available, but after 20+ attempts, the updates continuously fail. I've replaced the batteries in the keypad and unplugged the base as other posts had suggested, but still unable to update.  When I try to update through the key