diff --git a/Inc/config.h b/Inc/config.h
index 37bafe1..cab562f 100644
--- a/Inc/config.h
+++ b/Inc/config.h
@@ -3,9 +3,18 @@
 #define CONFIG_H
 
 
+/* on ubuntu install the following
+sudo apt -y install stlink-tools
+sudo systemctl restart udev
+
+flashing:
+connect power to pcb. Hold down power button. Run:
+pio run -t upload
+*/
+
 //Select the calibration values for the different pcbs
-#define BOBBYCAR_PCB_FRONT //Green PCB. black programming cable. outer power button
-//#define BOBBYCAR_PCB_REAR //Blue PCB. with XT60-U, beige programming cable. inner power button
+//#define BOBBYCAR_PCB_FRONT //Green PCB. black programming cable. outer power button
+#define BOBBYCAR_PCB_REAR //Blue PCB. with XT60-U, beige programming cable. inner power button
 //#define HOVERBRETT //Green PCB in Hoverbrett
 
 #include "stm32f1xx_hal.h"
@@ -104,8 +113,8 @@
 #define BAT_LVL4                (380 * BAT_CELLS * BAT_CALIB_ADC) / BAT_CALIB_REAL_VOLTAGE    // Yellow:       no beep
 #define BAT_LVL3                (370 * BAT_CELLS * BAT_CALIB_ADC) / BAT_CALIB_REAL_VOLTAGE    // Yellow blink: no beep 
 #define BAT_LVL2                (360 * BAT_CELLS * BAT_CALIB_ADC) / BAT_CALIB_REAL_VOLTAGE    // Red:          gently beep at this voltage level. [V*100/cell]. In this case 3.60 V/cell
-#define BAT_LVL1                (350 * BAT_CELLS * BAT_CALIB_ADC) / BAT_CALIB_REAL_VOLTAGE    // Red blink:    fast beep. Your battery is almost empty. Charge now! [V*100/cell]. In this case 3.50 V/cell
-#define BAT_DEAD                (337 * BAT_CELLS * BAT_CALIB_ADC) / BAT_CALIB_REAL_VOLTAGE    // All leds off: undervoltage poweroff. (while not driving) [V*100/cell]. In this case 3.37 V/cell
+#define BAT_LVL1                (330 * BAT_CELLS * BAT_CALIB_ADC) / BAT_CALIB_REAL_VOLTAGE    // Red blink:    fast beep. Your battery is almost empty. Charge now! [V*100/cell]. In this case 3.50 V/cell
+#define BAT_DEAD                (300 * BAT_CELLS * BAT_CALIB_ADC) / BAT_CALIB_REAL_VOLTAGE    // All leds off: undervoltage poweroff. (while not driving) [V*100/cell]. In this case 3.37 V/cell
 // ######################## END OF BATTERY ###############################