My BC246T has Firmware version 2.10, Released 10-13-2006. This is the newest firmware that I know of for the BC246T. Your version 1.42 is two versions back from that. All the firmware is available at the Yahoo BC246T group, if you don't want to register at the Uniden Web Site.
I really don't remember what the changes are, but they are minor between versions. It probably is worthwhile to upgrade to the latest version.
Mark