Ensure your box/dongle is firmly connected. Try a different USB port (preferably a rear port on desktop PCs) and verify that the smart card drivers are updated in Windows Device Manager.
The official changelog for version 2.7.7 (released [insert approximate date if known, else state "recently"]) includes several critical updates: octoplus box samsung software version 277 download portable
The portable version of the software allows users to run the software from a USB drive or other portable storage device, without the need for installation on the computer. Ensure your box/dongle is firmly connected