diff --git a/firmware/config/boards/hellen/hellen81/board.mk b/firmware/config/boards/hellen/hellen81/board.mk
index f1d4339b82..7480c9c49e 100644
--- a/firmware/config/boards/hellen/hellen81/board.mk
+++ b/firmware/config/boards/hellen/hellen81/board.mk
@@ -26,7 +26,7 @@ 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 += -DEFI_CAN_SERIAL=TRUE -DTS_CAN_DEVICE_SHORT_PACKETS_IN_ONE_FRAME=TRUE
+DDEFS += -DEFI_CAN_SERIAL=TRUE
 # todo debug:
 DDEFS += -DDISABLE_CAN_UPDATE_DASH=TRUE
 
diff --git a/firmware/config/boards/microrusefi/board.mk b/firmware/config/boards/microrusefi/board.mk
index e3aaafbe9a..036e750a93 100644
--- a/firmware/config/boards/microrusefi/board.mk
+++ b/firmware/config/boards/microrusefi/board.mk
@@ -26,7 +26,7 @@ endif
 # *TODO* need to give people the horrible choice between Bluetooth via TTL or SD card via SPI :( horrible choice 
 EFI_CONSOLE_TTL_PINS = -DEFI_CONSOLE_TX_BRAIN_PIN=GPIOB_10 -DEFI_CONSOLE_RX_BRAIN_PIN=GPIOB_11
 
-DDEFS += -DEFI_CAN_SERIAL=TRUE -DTS_CAN_DEVICE_SHORT_PACKETS_IN_ONE_FRAME=TRUE
+DDEFS += -DEFI_CAN_SERIAL=TRUE
 
 
 # Add them all together
diff --git a/java_console/io/src/main/java/com/rusefi/io/can/Elm327IoStream.java b/java_console/io/src/main/java/com/rusefi/io/can/Elm327IoStream.java
index 00c2bfa410..ff5aeace29 100644
--- a/java_console/io/src/main/java/com/rusefi/io/can/Elm327IoStream.java
+++ b/java_console/io/src/main/java/com/rusefi/io/can/Elm327IoStream.java
@@ -27,7 +27,8 @@ public class Elm327IoStream extends AbstractIoStream {
 
     // this should match the TS_CAN_DEVICE_SHORT_PACKETS_IN_ONE_FRAME in the firmware
     // todo: move this to rusefi_config.txt / prepend.txt?
-    private final static boolean sendShortPacketsInOneFrame = true;
+    private final static boolean sendShortPacketsInOneFrame = false;
+    //private final static boolean receiveShortPacketsInOneFrame = sendShortPacketsInOneFrame;
     private final static boolean receiveShortPacketsInOneFrame = false;
 
 	private final IsoTpCanDecoder canDecoder = new IsoTpCanDecoder();