The way to update special version WhatsApp to official version are a little different based on the android phone model. Please confirm your android phone model first and then provide the solution accordingly.
The main difference is that when uninstalling WhatsApp, Xiaomi phone will delete app data in the same time automatically. However, for other phone models, it will pop up a window asking if you want to keep app data or not.
1. For Xiaomi Phone
Follow the video to operate to copy special WhatsApp data to Official version：
Note: It is necessary to copy special version WhatsApp data to official version WhatsApp storage folder path first before uninstalling the WhatsApp.
For WhatsApp：https://drive.google.com/file/d/1Zhv7Hsrb86CVnSbU9D6c863I54cjE_9j/view?usp=sharing
For WhatsApp Business：https://drive.google.com/file/d/1FSrES1ExjLgdld1zPGF36x6HOlqiNDDr/view?usp=sharing
2. For other phone models SAMSUNG，OnePlus，VIVO，HUAWEI
Follow this video to operate to copy special WhatsApp data to Official version：
Note: You need to make sure you select Keep the app data when you see the popping up message as below.
For WhatsApp：https://drive.google.com/file/d/11POyHpZGebyCDuS08Y3nohdYGYLG07rS/view?usp=sharing
For WhatsApp Business：https://drive.google.com/file/d/12G9of9FAfFS047DXD-hq0ZognoJAfYhD/view?usp=sharing