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A new filing from BlackBerry Ltd. highlights how the erosion of its once-mighty business is spreading to areas that had still been strong even as it declined elsewhere.

The embattled smartphone maker, now in the midst of an auction for all or part of its operations, also said it expected fat restructuring charges.

Last Friday, BlackBerry posted a second-quarter loss of almost $1-billion, taking a massive hit on inventory of its new Z10 models.

In new documents filed yesterday with the Securities and Exchange Commission, BlackBerry said it also expects a hit of $400-million in restructuring charges as it begins to slash 40 per cent of its work force and take a knife to operating expenses. The comments are similar to those in a lengthy earnings document posted on BlackBerry's website.