From this passage, tell me what was Osborne Computer Corporation's mistake.

It's widely believed that Osborne Computer Corporation's bankruptcy was caused by the premature announcement of some highly performant successor models to their flagship Osborne 1 personal computer. The announcement was initially restricted, but as the news spread dealers cancelled orders for Osborne 1 in droves. The company drastically reduced the prices of Osborne 1 in reaction. This, however, didn't stop the decline in sales.