China’s leading memory chipmaker ChangXin Memory Technologies (CXMT) is gaining ground among local smartphone vendors, with some of its high-end chips finding their way into flagship Chinese handsets as vendors push into the premium market. ZTE-backed Nubia’s NaviX Ultra that went on sale on Wednesday used LPDDR5X DRAM chips from CXMT, the companies announced earlier this month. The handset was dubbed the Nubia Doubao phone due to its integration of TikTok parent ByteDance’s Doubao artificial...