diff --git a/hardware/arduino/bootloaders/diskloader/DiskLoader-Leonardo.hex b/hardware/arduino/bootloaders/diskloader/DiskLoader-Leonardo.hex
index b5b257fca..0e2c44532 100644
--- a/hardware/arduino/bootloaders/diskloader/DiskLoader-Leonardo.hex
+++ b/hardware/arduino/bootloaders/diskloader/DiskLoader-Leonardo.hex
@@ -1,6 +1,6 @@
 :10700000BDC00000E0C00000DEC00000DCC0000029
 :10701000DAC00000D8C00000D6C00000D4C0000014
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+:10702000D2C00000D0C00000C4C3000036C40000BD
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 :10704000C2C00000C0C00000BEC00000BCC0000044
 :10705000BAC00000B8C00000B6C00000B4C0000054
@@ -9,7 +9,7 @@
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@@ -21,158 +21,159 @@
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+:107AB000F1E7B1CF6196DEBFCDBFCF91DF91FF91EE
+:107AC000EF91BF91AF919F918F917F916F915F9156
+:107AD0004F913F912F911F91FF90EF900F900FBE0C
+:107AE0000F901F901895EE0FFF1F0590F491E02D59
+:067AF0000994F894FFCF99
+:087AF60000E1000000000000A7
 :040000030000700089
 :00000001FF
diff --git a/hardware/arduino/bootloaders/diskloader/src/DiskLoader.cpp b/hardware/arduino/bootloaders/diskloader/src/DiskLoader.cpp
index 30ac1b649..2792bc660 100644
--- a/hardware/arduino/bootloaders/diskloader/src/DiskLoader.cpp
+++ b/hardware/arduino/bootloaders/diskloader/src/DiskLoader.cpp
@@ -109,6 +109,9 @@ const u8 _consts[] =
 
 void start_sketch()
 {
+	if (pgm_read_word(0) == -1)		// no sketch has been uploaded yet - stay in bootloader
+		return;
+	
 	L_LED_OFF();
 	RX_LED_OFF();
 	TX_LED_OFF();