Be careful with the term "hot firmware." In tech slang, a "hot" firmware update is recently released but sometimes . For a GM220-S:
First, disconnect the power from the GM220-S and let it cool down completely. Once cooled, check:
One Gigabit Ethernet (GE) port and three Fast Ethernet (FE) ports. An integrated VoIP POTS telephone port. A 2×2 11n Wi-Fi module operating at 300Mbps.
remote OMCI (Optical Network Terminal Management and Control Interface)
To understand why the GM220-S runs hot, it helps to examine its hardware layout. The GM220-S is a highly compact, multi-functional network gateway. Packed inside its small plastic shell are: