The SP50 is a wideband radio (VHF: 146-174 MHz, UHF: 440-470 MHz usually). It cannot handle amateur frequencies outside its factory-tuned range without complex software hacks.
The official programming software for the Motorola SP50 is a legacy DOS-based application. It was designed in the 1990s to run on IBM-compatible personal computers. Core Specifications motorola radius sp50 programming software.zip
Select the "Write Radio" option (usually F8 ) to send the new data to the SP50. The SP50 is a wideband radio (VHF: 146-174
To help you get your legacy programming system running cleanly, tell me a bit more about your current setup: motorola radius sp50 programming software.zip