Hi,
I need to know where can I find bootloader hex file for ATMEGA32U4 microcontroller.
I have ATMEL-ice to program microcontroller bootloader.
I don't need sources, just only hex file for this ICE device.
Using recent versions of the Arduino IDE they are found at hardware/arduino/avr/bootloaders/caterina in your Arduino IDE installation folder or if you have installed an update to the Arduino AVR Boards via Boards manager at Arduino15/packages/arduino/hardware/avr/{version}/bootloaders/caterina. The location of Arduino15 can be found at File > Preferences > More preferences can be edited directly in the file.