To find out which firmware version you scanner has - hold down the following key combinations while turning on the 780XLT unit. [2], [4] & [9] will display the firmware version and checksum numbers.
BC780XLT
The initial firmware version is 1.19, checksum 8d 1AH.
Firmware version 1.20 was issued around May 2002 and removes all references to Uniden's SmartScanner frequency download service.
The firmware was updated in July 2002 to version 2.06 - changes?
UBC780XLT
The initial firmware version is 1.01, checksum FCd 0H.