WhatsApp has always removed the support for specific Android versions over the years during the development, and they have recently announced new obsolete versions!
WhatsApp is used to removing the support for specific Android versions. This is a common technique because developers always prefer to support the newest OS updates, and it’s hard to always support old versions.
When WhatsApp decides to remove the support for a specific Android or iOS version, the dev team also sees how many users are on that version, and the decision is confirmed when there aren’t a lot of users using the obsolete operating system version.
It’s the case of Android OS 4.0.4 and older versions: WhatsApp has announced that they will no longer support Android phones running those versions after a new WhatsApp beta for Android update.
What can you do to continue using WhatsApp on those versions? Unfortunately, you won’t be able to update WhatsApp after November 1, 2021, and your current WhatsApp update is going to expire after a certain date.
You need to switch to a new Android device on a supported Android version if your device is old, so be sure to back up your chat history. Note that WhatsApp is also going to support chat history migration from Android to iOS in a future update, if you’re interested to switch to iPhone.