The BC125AT is somewhat different than most of the other Uniden Scanners. So the Video's for the Uniden does not match how the Programming works.
In addition, this scanner doesn't use the traditional "programming cable" like most of their scanners use, but instead uses a USB cable with Mini Connections.
I need to know what windows version you're using. As the driver Uniden provides for this scanner doesn't seem to work on WIN 10, even though it works on any other Windows version such as WIN XP/7/8
Even with WINDOWS 7 or 8, the driver for this cable probably needs to be "repaired". Take a look at this set of instructions on some "fixes" for how to repair the driver.
Start on Step/Screen #8 Through Step 15, and follow those instructions. While these were primarily written for the BCD325/996P2, they apply to YOUR radio as well.
One you feel you've fixed the driver issue, go to Scancat and first try to READ THE ENTIRE RADIO, which is a drop down selection on the "Load / Read Radio.
look at this screen show
If you can "read" the frequencies in the radio, then usually it's fixed and you can program you scanner.
Let me know if there is any difficulties
Form details below.
First Name: RUDY
Zip Code: 77449
Comments: I RECENTLY BOUGHT SCANCAT-LITE PLUS FROM YOU GUYS. I INSTALLED THE SOFTWARE AND TRIED TO PROGRAM MY UNIDEN BC125AT SCANNER. THE SOFTWARE FINDS MY RADIO JUST FINE USING THE UNIDEN AUTO RADIO FINDER. BUT WHEN I GO TO LOAD MY FREQUENCYS IT WILL NOT UP LOAD THEM. I CHECK OUT THE VIDEOS ON YOU TUBE BUT IT DOESN\'T WORK LIKE THE VIDEO STATES. I DO NOT NO WHERE I AM GOING WRONG OR MAYBE THE SOFTWARE IS NOT COMPATA.BLE TO MY SCANNER. ANY HELP WOULD BE A BLESSING. IS THERE SOMEWHERE I CAN SEND OR TAKE MY SCANNER TO BE PROGRAMED . HELP!!!!!!
Jim Springer <(©¿©)>