Bain Capital is leading a consortium making a last minute bid for Toshiba Corp.'s (TOSYY) chip unit and the firm has added Apple Inc. (AAPL) - Get Report to its team in order to bolster the bid, sources told Reuters. 

Toshiba is looking to make a deal for the chip unit, which has been valued as high as $18 billion, before a Thursday deadline that was imposed by the company and the co-owner of the unit, Western Digital Corp. (WDC) - Get Report .

The revised Bain offer is worth 2 trillion yen, with Bain and South Korean chipmaker SK Hynix Inc paying 1.1 trillion yen, while Apple pays 400 billion yen and Japanese banks contributing the remaining money. 

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