When WhatsApp transfer from Android to iPhone is stuck at Activate the app and restore backup 66%, please refer to the resolution as below:
2. Reboot your Android phone and change and get a different USB cable.
3. On the android phone, set it to no screen lock all the time. Because for some phone models, once the screen is locked, it will kill all active apps that are running in the background, which will cause the connector app disabled.
4. Reconnect your phone to pc and open [Dr.Fone - WhatsApp Transfer] -> Backup Whatsapp messages from your android phone to pc first.
Note: Please don't use your android phone during the process.
Firstly, make sure to use the latest version software. You may re-download the latest version from our official website (https://drfone.wondershare.com/whatsapp-transfer-backup-and-restore.html ) or you can click Menu -> check for updates in the software.
After that, kindly try the steps below:
1. Get your android phone and go to [Settings] - [app applications] to find [Connector], then uninstall it.