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Unfortunately, you cannot. The expiration date is hard-coded into the server-side certificate. When Meta rotates their Root CA certificate, the old KitKat app will no longer be able to establish a secure connection. Whatsapp For Kitkat 4.4 2 Download Old Version
Some users report success with lighter messaging apps that still support older hardware, such as (which often supports Android 4.1+) or Facebook Lite Device Upgrade: Do you want to add something to this story
Why users seek old WhatsApp versions