diff --git a/firmware/config/boards/hellen/hellen-nb1/board.mk b/firmware/config/boards/hellen/hellen-nb1/board.mk
index ecb5689f83..51dca32527 100644
--- a/firmware/config/boards/hellen/hellen-nb1/board.mk
+++ b/firmware/config/boards/hellen/hellen-nb1/board.mk
@@ -21,8 +21,7 @@ DDEFS += -DLED_RUNING_BRAIN_PIN_MODE=INVERTED_OUTPUT
 DDEFS += -DLED_WARNING_BRAIN_PIN_MODE=INVERTED_OUTPUT
 DDEFS += -DLED_COMMUNICATION_BRAIN_PIN_MODE=INVERTED_OUTPUT
 
-# Disable serial ports on this board as UART3 causes a DMA conflict with the SD card
-DDEFS += -DTS_NO_PRIMARY -DTS_NO_SECONDARY
+DDEFS += -DTS_NO_SECONDARY
 
 # Add them all together
 DDEFS += -DEFI_USE_OSC=TRUE -DFIRMWARE_ID=\"hellenNB1\" $(DEFAULT_ENGINE_TYPE) $(LED_CRITICAL_ERROR_BRAIN_PIN) $(LED_COMMUNICATION_BRAIN_PIN)
@@ -31,6 +30,9 @@ DDEFS += -DEFI_ICU_INPUTS=FALSE -DHAL_TRIGGER_USE_PAL=TRUE
 # todo: is it broken?
 DDEFS += -DEFI_LOGIC_ANALYZER=FALSE
 
+# Enable serial pins on expansion header
+DDEFS += -DEFI_CONSOLE_TX_BRAIN_PIN=GPIOD_6 -DEFI_CONSOLE_RX_BRAIN_PIN=GPIOD_5 -DTS_PRIMARY_UART=UARTD2 -DSTM32_UART_USE_USART2=1
+
 # We are running on Hellen-One hardware!
 DDEFS += -DHW_HELLEN=1
 
diff --git a/firmware/console/binary/tunerstudio_io_serial.cpp b/firmware/console/binary/tunerstudio_io_serial.cpp
index 1cd432a5e2..e9a8aff6da 100644
--- a/firmware/console/binary/tunerstudio_io_serial.cpp
+++ b/firmware/console/binary/tunerstudio_io_serial.cpp
@@ -4,7 +4,7 @@
 
 #include "tunerstudio_io.h"
 
-#if HAS_PRIMARY || HAS_PRIMARY
+#if HAS_PRIMARY || HAS_SECONDARY
 #if HAL_USE_SERIAL
 void SerialTsChannel::start(uint32_t baud) {
 	SerialConfig cfg = {
@@ -65,4 +65,4 @@ size_t UartTsChannel::readTimeout(uint8_t* buffer, size_t size, int timeout) {
 	return size;
 }
 #endif // HAL_USE_UART
-#endif // HAS_PRIMARY || HAS_PRIMARY
+#endif // HAS_PRIMARY || HAS_SECONDARY