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  2026/4/9    12:07       221305 TT19C_Li_A7670_Mul_HTTP_Standard_V3.4.dfu
  2026/4/9    12:07       222689 TT19C_Li_A7670_Mul_MQTT_Standard_V3.4.dfu
  2026/4/9    12:07       212933 TT19C_Li_A7670_Mul_TCP_Standard_V3.4.dfu