The modified WhatsApp will enable MobileTrans to have the access to write the WhatsApp chats on your Android phone temporarily so that we will install a modified WhatsApp on your Android phone.
Please rest assured that this App will not save or leak any of your privacy. After the transfer completes, it's suggested to uninstall the modified App and download the official WhatsApp on your Android phone. After signing in, you will see all your WhatsApp chats on your Android phone.
Currently, this is the only way to transfer your WhatsApp chats between phones. If you still have doubts, you have to give up to do this.