def METHOD_NAME(hex_timestamp: bytes) -> str:
    """Decode an hexadecimale timestamp to localtime with the format %H:%M.
    Args:
        hex_timestamp: the hexadecimale timestamp.
    Return:
        Localtime string with %H:%M format. e.g. "20:30".
    """
    hex_time = (
        hex_timestamp[6:8]
        + hex_timestamp[4:6]
        + hex_timestamp[2:4]
        + hex_timestamp[0:2]
    )
    int_time = int(hex_time, 16)
    local_time = time.localtime(int_time)
    return time.strftime("%H:%M", local_time)