While the global MEB platform is shared, the Chinese ID.4 versions (ID.4 X by SAIC-VW and ID.4 Crozz by FAW-VW) run on a unique software branch often referred to as Hardware Speed
To bridge the gap, VW established , their dedicated software arm in the country. While the global CARIAD division has faced hurdles, the Chinese arm is moving quickly. They have partnered with local tech leaders (most notably a joint venture with Xpeng ) to fast-track software development. vw id 4 china software update