Research In Motion Ltd. fell the most in more than a month after Pacific Crest Securities said the company’s new BlackBerry 10 operating system, the linchpin of its comeback plan, may be dead on arrival.

“We believe BB10 is likely to be DOA,” James Faucette, a Pacific Crest analyst in Portland, Oregon, said in a report. He has the equivalent of a sell rating on the shares. “We expect the new OS to be met with a lukewarm response at best and ultimately likely to fail.”

Read the whole story at BusinessWeek