The new version of firmware, which shall be official at the Hackaday Belgrade Conference, contains the firmware which integrates Bootloader and Kernel function. It occupies 6 K of Program Memory, so there is 26 K available for user code.

This will make the process of writing the user code significantly easier. Kernel contains the following transparent functions:

- LED display refresh
- Debouncer and edge detection for all keys
- Brightness high/low service in 16 steps, with physiological linearization
- Pause and Sleep/Wake Up service
- Optical communication service via serial port, with embedded protocol (which includes serial number as recipient's address)

There is also Demo Application software, with Moving Message Display, Tetris game and Accelerometer demo software (if hardware module GY-521 is available). This software is not a part of Kernel, ant it will be overwritten at the next software bootloading.

Details are in the updated PDF file Hackaday Belgrade Badge Manual (version 2), which is in the FILES page