diff --git a/docs/Bootloaders.md b/docs/Bootloaders.md
index 05163dd6..94b9b0dd 100755
--- a/docs/Bootloaders.md
+++ b/docs/Bootloaders.md
@@ -53,7 +53,7 @@ To flash the bootloader itself use something like:
 ```
 wget 'https://github.com/arduino/Arduino/raw/1.8.5/hardware/arduino/avr/bootloaders/stk500v2/stk500boot_v2_mega2560.hex'
 
-avrdude -cavrispv2 -patmega2560 -P/dev/ttyACM0 -b115200 -e -u -U lock:w:0x3F:m -U efuse:w:0xFD:m -U hfuse:w:0xD8:m
+avrdude -cavrispv2 -patmega2560 -P/dev/ttyACM0 -b115200 -e -u -U lock:w:0x3F:m -U efuse:w:0xFD:m -U hfuse:w:0xD8:m -U lfuse:w:0xFF:m
 avrdude -cavrispv2 -patmega2560 -P/dev/ttyACM0 -b115200 -U flash:w:stk500boot_v2_mega2560.hex
 avrdude -cavrispv2 -patmega2560 -P/dev/ttyACM0 -b115200 -U lock:w:0x0F:m
 ```
@@ -72,7 +72,7 @@ To flash the bootloader itself use something like:
 ```
 wget 'https://github.com/arduino/Arduino/raw/1.8.5/hardware/arduino/avr/bootloaders/atmega/ATmegaBOOT_168_atmega1280.hex'
 
-avrdude -cavrispv2 -patmega1280 -P/dev/ttyACM0 -b115200 -e -u -U lock:w:0x3F:m -U efuse:w:0xF5:m -U hfuse:w:0xDA:m
+avrdude -cavrispv2 -patmega1280 -P/dev/ttyACM0 -b115200 -e -u -U lock:w:0x3F:m -U efuse:w:0xF5:m -U hfuse:w:0xDA:m -U lfuse:w:0xFF:m
 avrdude -cavrispv2 -patmega1280 -P/dev/ttyACM0 -b115200 -U flash:w:ATmegaBOOT_168_atmega1280.hex
 avrdude -cavrispv2 -patmega1280 -P/dev/ttyACM0 -b115200 -U lock:w:0x0F:m
 ```
@@ -90,7 +90,7 @@ To flash the bootloader itself use something like:
 ```
 wget 'https://github.com/Lauszus/Sanguino/raw/1.0.2/bootloaders/optiboot/optiboot_atmega1284p.hex'
 
-avrdude -cavrispv2 -patmega1284p -P/dev/ttyACM0 -b115200 -e -u -U lock:w:0x3F:m -U efuse:w:0xFD:m -U hfuse:w:0xDE:m
+avrdude -cavrispv2 -patmega1284p -P/dev/ttyACM0 -b115200 -e -u -U lock:w:0x3F:m -U efuse:w:0xFD:m -U hfuse:w:0xDE:m -U lfuse:w:0xFF:m
 avrdude -cavrispv2 -patmega1284p -P/dev/ttyACM0 -b115200 -U flash:w:optiboot_atmega1284p.hex
 avrdude -cavrispv2 -patmega1284p -P/dev/ttyACM0 -b115200 -U lock:w:0x0F:m
 ```
@@ -129,7 +129,7 @@ use something like:
 ```
 wget 'https://github.com/arduino/Arduino/raw/1.8.5/hardware/arduino/avr/bootloaders/optiboot/optiboot_atmega168.hex'
 
-avrdude -cavrispv2 -patmega168 -P/dev/ttyACM0 -b115200 -e -u -U lock:w:0x3F:m -U efuse:w:0x04:m -U hfuse:w:0xDD:m
+avrdude -cavrispv2 -patmega168 -P/dev/ttyACM0 -b115200 -e -u -U lock:w:0x3F:m -U efuse:w:0x04:m -U hfuse:w:0xDD:m -U lfuse:w:0xFF:m
 avrdude -cavrispv2 -patmega168 -P/dev/ttyACM0 -b115200 -U flash:w:optiboot_atmega168.hex
 avrdude -cavrispv2 -patmega168 -P/dev/ttyACM0 -b115200 -U lock:w:0x0F:m
 ```