Warning: The internet is flooded with malware disguised as "Baofeng drivers." You must download only from trusted sources.
Before you open the programming software, your computer needs to recognize the radio. baofeng bf-t99 plus software
If searching online, look for:
Set a "Priority Channel" (usually Channel 1). The radio will leave other channels every 2 seconds to check if the priority channel has activity. This is vital for security work. Warning: The internet is flooded with malware disguised