The V161 software update for the ICC is an example of Audi's ongoing efforts to improve the security and functionality of their immobilizer systems. This update may include enhancements to the system's response to key fob signals, improvements in encryption, and better diagnostics for troubleshooting. While specific details about the V161 software are not publicly available due to proprietary reasons, it's clear that such updates are essential for maintaining the high security standards of Audi vehicles.