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The profit gain was largely due to "a significantly improved performance in electronic devices, driven mainly by the return to profit of the LCD business and demand expansion in NAND flash memories," it said in a statement.Toshiba upgraded its net profit forecast for the year to March to 100 billion yen from its earlier estimate of 70 billion yen, while downgrading its sales forecast to 6.6 trillion yen from 7.0 trillion yen projected earlier.