RIM on Friday braced itself for a "purported" class action lawsuit leveled against it by Holzer Holzer & Fistel. Following an investigation started by the law firm early in the week, the BlackBerry maker claimed that assertions it misled investors on the health of its phone business were "without merit." HH&F had argued that the company was hiding the impact of an "aging product line" in statements between December 10 of last year and April 28, when it warned of low BlackBerry sales.