diff --git a/left/src/bootloader.c b/left/src/bootloader.c
index a5784b3..180c12a 100644
--- a/left/src/bootloader.c
+++ b/left/src/bootloader.c
@@ -1,3 +1,4 @@
+#include "i2c_addresses.h"
 #include "bootloader.h"
 
 /* bits for enabledPeripherals */
@@ -9,12 +10,12 @@
 #define ENABLE_PERIPHERAL_USB_MSC  (1<<7)
 
 __attribute__((used, section(".BootloaderConfig"))) const bootloader_config_t BootloaderConfig = {
-    .tag = 0x6766636B,                    // Magic Number
-    .enabledPeripherals = ENABLE_PERIPHERAL_I2C /*0xE2*/,           // Enabled Peripheral: I2C
-    .i2cSlaveAddress = 0x10,              // Use user-defined I2C address
-    .peripheralDetectionTimeoutMs = 300,  // Use user-defined timeout (ms)
-    .clockFlags = 0xFF,                   // Disable High speed mode
-    .clockDivider = 0xFF,                 // Use clock divider (0)
+    .tag = 0x6766636B,                                            // Magic Number
+    .enabledPeripherals = ENABLE_PERIPHERAL_I2C,
+    .i2cSlaveAddress = I2C_ADDRESS_LEFT_KEYBOARD_HALF_BOOTLOADER,
+    .peripheralDetectionTimeoutMs = 300,
+    .clockFlags = 0xFF,                                           // Disable High speed mode
+    .clockDivider = 0xFF,                                         // Use clock divider (0)
 };
 
 void JumpToBootloader(void) {