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 2025/9/29    15:21       209821 TT19_Li_A7670_Mul_HTTP_Standard_V2.8.dfu
 2025/9/29    15:29       212813 TT19_Li_A7670_Mul_MQTT_Standard_V2.8.dfu
 2025/9/29    15:01       201585 TT19_Li_A7670_Mul_TCP_Standard_V2.8.dfu