Couple of things I'd like you to do.
First, can you provide a link to where you downloaded the firmware from?
Would you follow these steps and tell me what version of firmware is shown on the scanner:
Press the MENU button, now turn the Function knob until you see Settings highlighted in black. Press the Function knob once. Now turn the Function knob until you see See Scanner Info highlighted in black. Press the Function knob once and then turn the Function knob to where Firmware Version is highlighted in black, press the function knob again and post what you see in the display window for Firmware version. I don't need all the numbers that start with SN... listed under the Version number, just what is shown under where it says Firmware version.
As far as I know, all BCT15x's sold today have the correct firmware version, 1.03.00, installed in them.
I can't tell you what happens if you try and install the same Firmware version over the existing version if it's the same one and that's what happened, I'm not sure.
Another possibility is maybe you didn't follow the steps exactly as described in the instructions where you downloaded the Firmwear update from?