diff --git a/bootloaders/caterina_LUFA/Caterina.c b/bootloaders/caterina_LUFA/Caterina.c
index b6fbd9b..d4dbb7b 100755
--- a/bootloaders/caterina_LUFA/Caterina.c
+++ b/bootloaders/caterina_LUFA/Caterina.c
@@ -64,6 +64,9 @@ uint16_t RxLEDPulse = 0; // time remaining for Rx LED pulse
 /* Bootloader timeout timer */
 uint16_t Timeout = 0;
 
+uint16_t bootKey = 0x7777;
+volatile uint16_t *const bootKeyPtr = (volatile uint16_t *)0x0A00;
+
 void StartSketch(void)
 {
 	cli();
@@ -118,6 +121,11 @@ int main(void)
 	if (mcusr_state & (1<<PORF) && pgm_read_word(0) != 0xFFFF) {		
 		StartSketch();
 	}
+	uint16_t bootKeyPtrVal = *bootKeyPtr;
+	*bootKeyPtr = 0;
+	if ((mcusr_state & (1<<WDRF)) && (bootKeyPtrVal != bootKey) && (pgm_read_word(0) != 0xFFFF)) {	
+		StartSketch();
+	}
 	
 	/* Setup hardware required for the bootloader */
 	SetupHardware();
diff --git a/bootloaders/caterina_LUFA/Caterina.h b/bootloaders/caterina_LUFA/Caterina.h
index 7f37063..f8251d4 100755
--- a/bootloaders/caterina_LUFA/Caterina.h
+++ b/bootloaders/caterina_LUFA/Caterina.h
@@ -80,7 +80,7 @@
 
 	/* Function Prototypes: */
 		void StartSketch(void);
-		void LEDPulse();
+		void LEDPulse(void);
 	
 		void CDC_Task(void);
 		void SetupHardware(void);
diff --git a/bootloaders/caterina_LUFA/Caterina.hex b/bootloaders/caterina_LUFA/Caterina.hex
index 3657484..7e19013 100644
--- a/bootloaders/caterina_LUFA/Caterina.hex
+++ b/bootloaders/caterina_LUFA/Caterina.hex
@@ -1,6 +1,6 @@
 :1070000055C000006EC000006CC000006AC00000E7
 :1070100068C0000066C0000064C0000062C00000DC
-:1070200060C000005EC00000DCC400005AC0000068
+:1070200060C000005EC00000F8C400005AC000004C
 :1070300058C0000056C0000054C0000052C00000FC
 :1070400050C0000078C000004CC000004AC00000E2
 :1070500048C0000046C0000044C0000042C000001C
@@ -9,22 +9,22 @@
 :1070800030C000002EC000002CC000002AC000004C
 :1070900028C0000026C0000024C0000022C000005C
 :1070A00020C000001EC000001CC0000011241FBE34
-:1070B000CFEFDAE0DEBFCDBF11E0A0E0B1E0E6E067
-:1070C000FFE702C005900D92A03CB107D9F711E08F
-:1070D000A0ECB1E001C01D92A63DB107E1F78ED34F
-:1070E00010C78ECFF89410926F001092810010920A
+:1070B000CFEFDAE0DEBFCDBF11E0A0E0B1E0EEE35C
+:1070C000FFE702C005900D92A83AB107D9F711E089
+:1070D000A8EAB1E001C01D92AE3BB107E1F78ED343
+:1070E0002CC78ECFF89410926F00109281001092EE
 :1070F00085001092840081E085BF15BE47985D9A97
-:10710000289A0C94000008952091CA013091CB0177
-:107110002F5F3F4F3093CB012093CA01932F37FF4E
+:10710000289A0C94000008952091B2013091B301A7
+:107110002F5F3F4F3093B3012093B201932F37FF7E
 :1071200003C08EEF831B982F990F921710F4479886
 :107130000895479A08951F920F920FB60F92112447
 :107140002F938F939F93EF93FF931092850010924C
-:1071500084008091C0019091C101009741F0019796
-:107160009093C1018093C001892B09F45D9A8091AD
-:10717000C2019091C301009741F001979093C30120
-:107180008093C201892B09F4289AE0E0F0E0859110
-:1071900094918F5F9F4F49F08091C4019091C501F8
-:1071A00001969093C5018093C401FF91EF919F9147
+:1071500084008091A8019091A901009741F00197C6
+:107160009093A9018093A801892B09F45D9A8091DD
+:10717000AA019091AB01009741F001979093AB0168
+:107180008093AA01892B09F4289AE0E0F0E0859128
+:1071900094918F5F9F4F49F08091AC019091AD0128
+:1071A00001969093AD018093AC01FF91EF919F9177
 :1071B0008F912F910F900FBE0F901F90189584E024
 :1071C0008093E9000DC08091E8008B778093E80000
 :1071D00003C08EB3882351F08091E80082FFF9CF7D
@@ -32,12 +32,12 @@
 :1071F00083E08093E9008091E80085FD0DC08091D7
 :10720000E8008E778093E80003C08EB3882369F08E
 :107210008091E80080FFF9CF9093F1005D9884E6BB
-:1072200090E09093C1018093C00108954F925F92C6
+:1072200090E09093A9018093A80108954F925F92F6
 :107230006F927F928F929F92AF92BF92CF92DF9286
 :10724000EF92FF920F931F93CF93DF9384E080938D
 :10725000E9008091E80082FF56C2289884E690E019
-:107260009093C3018093C201AADF182F853419F4CB
-:107270001092090103C0843519F4A1DF8DE019C211
+:107260009093AB018093AA01AADF182F853419F4FB
+:1072700010920D0103C0843519F4A1DF8DE019C20D
 :107280008C34E1F38035D1F3843721F484E4AFDF2B
 :1072900080E00FC2813611F489E50BC28134B1F46C
 :1072A0008EDF182F8CDF90E0880F991FAA2797FD9B
@@ -57,54 +57,54 @@
 :107380005700849196C1813539F4E2E0F0E089E05C
 :107390008093570084918DC1823631F489E527DFCF
 :1073A00080E025DF80E885C1823419F0873609F056
-:1073B000E5C01092C5011092C40101DF082FFFDE65
+:1073B000E5C01092AD011092AC0101DF082FFFDE95
 :1073C000F82EFDDE682E8554823008F071C1902FB2
 :1073D00080E0CF2DD0E0C82BD92B10926F0017364C
 :1073E00009F04BC081E180935700E895DD24CC245F
-:1073F000C3943FC0E090C601F090C7010091C8015E
-:107400001091C901B6E46B16D9F4ED2DF0E0EE2928
+:1073F000C3943FC0E090AE01F090AF010091B001A6
+:107400001091B101B6E46B16D9F4ED2DF0E0EE2940
 :10741000FF29E4918E2FEBDEDD2081F082E090E009
-:10742000A0E0B0E0E80EF91E0A1F1B1FE092C601A3
-:10743000F092C7010093C8011093C901DC2418C061
-:10744000D801C701B695A7959795879544D5CFDE06
+:10742000A0E0B0E0E80EF91E0A1F1B1FE092AE01BB
+:10743000F092AF010093B0011093B101DC2418C0A9
+:10744000D801C701B695A7959795879560D5CFDEEA
 :1074500082E090E0A0E0B0E0E80EF91E0A1F1B1FDA
-:10746000E092C601F092C7010093C8011093C901D0
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+:107580000091AE011091AF011ADE90E021E0F80108
 :107590000C0120935700E895112470CE833619F51D
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 :1075B00006DEF701E16090E021E00C012093570026
 :1075C000E895112482E090E0A0E0B0E0E80EF91E1A
-:1075D0000A1F1B1FE092C601F092C7010093C80169
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-:1075F000C70185E080935700E89507B600FCFDCFF2
-:107600003DCE823551F4E091C601F091C70105915C
+:1075D0000A1F1B1FE092AE01F092AF010093B001B1
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+:107600003DCE823551F4E091AE01F091AF0105918C
 :107610001491812FECDD802F4CC0843421F5E09053
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-:10765000A11DB11D8093C6019093C701A093C801DD
-:10766000B093C9010BCE843609F5E090C601F090C5
-:10767000C7010091C8011091C901D801C701B69591
-:10768000A7959795879527D4B2DD82E090E0A0E09A
-:10769000B0E0E80EF91E0A1F1B1FE092C601F0922F
-:1076A000C7010093C8011093C90104C08B3111F0C8
+:10762000AE01F090AF010091B0011091B10116953B
+:107630000795F794E794C3DD682FC70170D4809154
+:10764000AE019091AF01A091B001B091B10102964D
+:10765000A11DB11D8093AE019093AF01A093B00125
+:10766000B093B1010BCE843609F5E090AE01F090F5
+:10767000AF010091B0011091B101D801C701B695D9
+:10768000A7959795879543D4B2DD82E090E0A0E07E
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 :1076C000E8008E778093E80095FF04C010C08EB369
 :1076D0008823C9F08091E80080FFF9CF8091E8000D
@@ -112,144 +112,146 @@
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 :10776000E8000895913279F48091E800877F809352
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diff --git a/bootloaders/caterina_LUFA/Descriptors.c b/bootloaders/caterina_LUFA/Descriptors.c
index b5b1aee..f1756e2 100755
--- a/bootloaders/caterina_LUFA/Descriptors.c
+++ b/bootloaders/caterina_LUFA/Descriptors.c
@@ -195,14 +195,14 @@ const USB_Descriptor_String_t ProductString =
 
 	.UnicodeString          = L"Arduino Leonardo"
 };
-
+/*
 const USB_Descriptor_String_t SerialNumString = 
 {
 	.Header					= {.Size = USB_STRING_LEN(12), .Type = DTYPE_String},
 	
 	.UnicodeString			= L"000000001452"
 };
-
+*/
 const USB_Descriptor_String_t ManufNameString = 
 {
 	.Header					= {.Size = USB_STRING_LEN(11), .Type = DTYPE_String},
@@ -246,10 +246,10 @@ uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
 			{
 				Address = &ProductString;
 				Size    = ProductString.Header.Size;
-			} else if (DescriptorNumber == DeviceDescriptor.SerialNumStrIndex)
-			{
-				Address = &SerialNumString;
-				Size 	= SerialNumString.Header.Size;
+//			} else if (DescriptorNumber == DeviceDescriptor.SerialNumStrIndex)
+//			{
+//				Address = &SerialNumString;
+//				Size 	= SerialNumString.Header.Size;
 			} else if (DescriptorNumber == DeviceDescriptor.ManufacturerStrIndex)
 			{
 				Address = &ManufNameString;
diff --git a/cores/arduino/CDC.cpp b/cores/arduino/CDC.cpp
index deda5c0..0fa06bc 100644
--- a/cores/arduino/CDC.cpp
+++ b/cores/arduino/CDC.cpp
@@ -105,7 +105,8 @@ bool WEAK CDC_Setup(Setup& setup)
 			// open at 1200 bps, is closed.  this is the signal to start the watchdog
 			// with a relatively long period so it can finish housekeeping tasks
 			// like servicing endpoints before the sketch ends
-			if (0 != _usbLineInfo.lineState && 1200 == _usbLineInfo.dwDTERate) {	
+			if (0 != _usbLineInfo.lineState && 1200 == _usbLineInfo.dwDTERate) {
+				*(uint16_t *)0x0A00 = 0x7777;
 				wdt_enable(WDTO_2S);
 			}
 			return true;