A version identifier such as 4.0.2 typically represents a minor patch (0.2) on top of a major system overhaul (4.0).
October 26, 2023 Category: Firmware Update / Set-Top Box
of your set-top box to ensure you're using the right firmware? Stb Erom Upgrade - Google Groups
"Ver 4.0.2 optimizes reception," the voice continued. "Standard terrestrial signals are insufficient. Upgrading to universal spectrum."
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