Bain Capital-backed Kioxia, an Apple NAND flash supplier, has filed for an IPO and aims for a December offering.Kioxia's previous attempt for an IPO was scrapped after investors pushed for a lower valuation.A Bain-led consortium acquired Kioxia from Toshiba six years ago for 2 trillion yen.Kioxia faces challenges due to the downturn in the memory chip market and competition from rivals.