: Google stopped releasing official security patches for Android Marshmallow years ago. Your entire device—including your personal chats—is highly vulnerable to unpatched exploits.
Modern messaging applications rely heavily on advanced end-to-end encryption protocols. Android 5.0 and 5.1 utilize outdated cryptographic libraries that are increasingly vulnerable to modern exploits. By shifting the baseline to Android 6.0.1, WhatsApp ensures that all active users benefit from more secure system kernels and better data isolation mechanisms. 2. Modern Feature Integration About supported operating systems | WhatsApp Help Center will whatsapp work on android 6.0.1
WhatsApp relies entirely on end-to-end encryption. Older operating systems lack the modern cryptographic libraries needed to secure data against sophisticated modern malware. : Google stopped releasing official security patches for