The latest firmware version is 1.03.06. If this is what is in your radio it can not be updated.
Do you have a known good connection from pc to radio?
The correct direction would be:
go to the Uniden site, and click support... (or here) -> [link]
If you don't have an account with Uniden, create one by clicking the links to the right side of the page.
Once you have an account - you need to tell Uniden what radios are in your collection.
They ask this, so if there are any new releases, they can e-mail you - and I'm sure they do it to "advertise" to you also...
Once you are through with that, you can move to the download sections.
You need to download 2 files... The actual Firmware, and the Firmware Loader.
Once you have both pieces of software, you need to do the following:
Load the Firmware Loader.. (BC_VUP). Then, open the firmware file you downloaded.
The Uniden software will give you directions to follow, and your radio will then be updated.
Fixes from your version to the newer version:
Fire tone outs - no longer require a delay time.. Just put in tone-a and tone-b.
And, I'm sure there are a few other "minor" upgrades as well.
If you need help.... I can assist.. I've upgraded quite a few uniden radios, and I've done a handfull of BR330Ts as well.