diff --git a/platformio.ini b/platformio.ini
index 4d2bfee4d..85ebc08bd 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -105,7 +105,7 @@ build_type = release
 board_build.filesystem = littlefs
 lib_deps =
   bblanchon/ArduinoJson @ 7.4.2
-  ESP32Async/AsyncTCP @ 3.4.9
+  ESP32Async/AsyncTCP @ 3.4.10
   ESP32Async/ESPAsyncWebServer @ 3.9.3
   https://github.com/emsesp/EMS-ESP-Modules.git @ 1.0.8
 
diff --git a/src/devices/thermostat.cpp b/src/devices/thermostat.cpp
index cdf30e386..e1242e6ac 100644
--- a/src/devices/thermostat.cpp
+++ b/src/devices/thermostat.cpp
@@ -1228,7 +1228,7 @@ void Thermostat::process_RC300Summer(std::shared_ptr<const Telegram> telegram) {
 
     if (hc->heatingtype != 3) {
         has_update(telegram, hc->designtemp, 4);
-        has_update(telegram, hc->minflowtemp, 13);
+        has_update(telegram, hc->minflowtemp, model() == EMSdevice::EMS_DEVICE_FLAG_BC400 ? 13 : 8);
     } else {
         has_update(telegram, hc->designtemp, 5);
         has_update(telegram, hc->minflowtemp, 8);
diff --git a/src/emsesp_version.h b/src/emsesp_version.h
index 515d6895e..7ae47456b 100644
--- a/src/emsesp_version.h
+++ b/src/emsesp_version.h
@@ -1 +1 @@
-#define EMSESP_APP_VERSION "3.8.1-dev.2"
+#define EMSESP_APP_VERSION "3.8.1-dev.3"
diff --git a/src/uart/emsuart_esp32.cpp b/src/uart/emsuart_esp32.cpp
index 2b7bf1fd3..f09e4542d 100644
--- a/src/uart/emsuart_esp32.cpp
+++ b/src/uart/emsuart_esp32.cpp
@@ -52,7 +52,8 @@ void EMSuart::uart_event_task(void * pvParameters) {
                     uart_read_bytes(EMSUART_NUM, telegram, length, portMAX_DELAY);
                     EMSESP::incoming_telegram(telegram, (uint8_t)(length - 1));
                 } else { // flush buffer up to break
-                    uart_flush_input(EMSUART_NUM);
+                    uint8_t buf[UART_FIFO_LEN];
+                    uart_read_bytes(EMSUART_NUM, buf, length, portMAX_DELAY);
                 }
                 length = 0;
             } else if (event.type == UART_BUFFER_FULL) {