It looks like you're looking for the programming software for the radio.
Here’s a clear, helpful response you can use or adapt: motorola mt 777 programing software download
Search for “Motorola MT 777 programming” on professional two-way radio forums (like Communications Support or RadioReference) — they can guide you to a legitimate source if you are a qualified technician. Would you like help finding a compatible programming cable or the radio’s specification sheet instead? It looks like you're looking for the programming
The Motorola MT 777 is an older portable two-way radio model. Programming software for legacy Motorola radios is generally not available for direct public download from Motorola’s main consumer website — it was distributed to authorized dealers and service centers only. motorola mt 777 programing software download