Fix bootloaders incorrectly checking the BOOTRST fuse on start (thanks to Braden Kell).

Bootloaders/CDC/BootloaderCDC.c

@@ -97,7 +97,7 @@ void Application_Jump_Check(void)
 		JTAG_ENABLE();
 	#else
 		/* Check if the device's BOOTRST fuse is set */
-		if (BootloaderAPI_ReadFuse(GET_HIGH_FUSE_BITS) & FUSE_BOOTRST)
+		if (!(BootloaderAPI_ReadFuse(GET_HIGH_FUSE_BITS) & ~FUSE_BOOTRST))
 		{
 			/* If the reset source was not an external reset or the key is correct, clear it and jump to the application */
 			if (!(MCUSR & (1 << EXTRF)) || (MagicBootKey == MAGIC_BOOT_KEY))

Bootloaders/DFU/BootloaderDFU.c

@@ -133,7 +133,7 @@ void Application_Jump_Check(void)
 		JTAG_ENABLE();
 	#else
 		/* Check if the device's BOOTRST fuse is set */
-		if (BootloaderAPI_ReadFuse(GET_HIGH_FUSE_BITS) & FUSE_BOOTRST)
+		if (!(BootloaderAPI_ReadFuse(GET_HIGH_FUSE_BITS) & ~FUSE_BOOTRST))
 		{
 			/* If the reset source was not an external reset or the key is correct, clear it and jump to the application */
 			if (!(MCUSR & (1 << EXTRF)) || (MagicBootKey == MAGIC_BOOT_KEY))

Bootloaders/MassStorage/BootloaderMassStorage.c

@@ -114,7 +114,7 @@ void Application_Jump_Check(void)
 		JTAG_ENABLE();
 	#else
 		/* Check if the device's BOOTRST fuse is set */
-		if (BootloaderAPI_ReadFuse(GET_HIGH_FUSE_BITS) & FUSE_BOOTRST)
+		if (!(BootloaderAPI_ReadFuse(GET_HIGH_FUSE_BITS) & ~FUSE_BOOTRST))
 		{
 			/* If the reset source was not an external reset or the key is correct, clear it and jump to the application */
 			if (!(MCUSR & (1 << EXTRF)) || (MagicBootKey == MAGIC_BOOT_KEY))

Bootloaders/Printer/BootloaderPrinter.c

@@ -146,7 +146,7 @@ void Application_Jump_Check(void)
 		JTAG_ENABLE();
 	#else
 		/* Check if the device's BOOTRST fuse is set */
-		if (BootloaderAPI_ReadFuse(GET_HIGH_FUSE_BITS) & FUSE_BOOTRST)
+		if (!(BootloaderAPI_ReadFuse(GET_HIGH_FUSE_BITS) & ~FUSE_BOOTRST))
 		{
 			/* If the reset source was not an external reset or the key is correct, clear it and jump to the application */
 			if (!(MCUSR & (1 << EXTRF)) || (MagicBootKey == MAGIC_BOOT_KEY))

LUFA/DoxygenPages/ChangeLog.txt

@@ -21,6 +21,7 @@
   *  - Library Applications:
   *   - Fixed bootloaders not disabling global interrupts during erase and write operations (thanks to Zoltan)
   *   - Fixed bootloaders accepting flash writes to the bootloader region (thanks to NicoHood)
+  *   - Fixed bootloaders incorrectly checking the BOOTRST fuse on start (thanks to Braden Kell)
   *
   *  \section Sec_ChangeLog170418 Version 170418
   *  <b>New:</b>