For cars with very old software (2.x), dealers flash the update via USB-C diagnostic port. This is mandatory for early 2022 ID.4s that never received an OTA. Cost: Free under warranty / recall campaign.
No major OTA update is perfect. Based on early adopter forums (Xiaohongshu and Autohome), here is the honest feedback after the : vw id 4 china software update new
: Enables remote lock/unlock features via smartphone apps and allows Apple CarPlay maps to display in the driver’s instrument cluster. Update Methods for Chinese Models Dealer Visit (Recommended) For cars with very old software (2