• Part 1: Undelete lost contacts from Vivo . (on macOS)
• Part 2: Undelete lost contacts from Vivo . (on Windows)

Step 1:  Download and launch the Android Data Recovery on Mac
Download and install the Android Data Recovery on your Mac computer, when you open it, a dialog box will pop up to remind you whether to register, purchase or free try.

Step 2: Connection
Run this powerful Android data recovering software on your Mac computer, and then connect your Vivo Y27s device to computer via the USB cable. The program will detect your device automatically.

Step 3: Enable USB debugging.
Android Data Recovery will prompt you to enable USB debugging on your Vivo Y27s, if you don’t open the debugging mode. The program will detect the version of your Vivo Y27s automatically and give you the instruction of opening the USB debugging mode on your Vivo Y27s. After finishing the operations on your device, click “OK” button.

Step 4: Select the contacts you want to recover.
After connection, all file types on your Vivo Y27s will be showed in the interface. Choose the file types you want to recover, such as contacts, messages, messages attachments, call logs, photos, gallery, picture library, videos, audios and other documents. Check the file types you want to recover and click Next. The program will scan your device automatically.

Step 5: click “Recover” button to complete recovering Vivo Y27s’s contacts
When the scanning is finished, all types of files will be listed in categories on the left control. You are allowed to check the detailed information of each data. Preview and select the data you want to recover, and then click “Recover” button to complete recovering process.

Step 1: Download and launch the Android Data Recovery
Download and install the Android Data Recovery on your Windows computer.

Step 2: Connection
Connect your Vivo Y27s device to your Windows computer via the USB cable. Wait for seconds before the device is detected. Install the device driver on your computer if it hasn’t been installed.

Step 3: Enable USB debugging.
Allow USB debugging when your Android prompts you of USB debugging permission. After finishing the operations on your Vivo Y27s device, click “OK” button.

Step 4: Preview and recover the Vivo Y27s’s lost contacts.
Soon, all Android available files will be classified into category on the left. You can toggle the button of “Only display the deleted item(s)” to “On”, so that you can quickly find the wanted Android file. Click “Recover” button and choose a destination folder to recover files. Within seconds, you can navigate to the file folder and check your deleted files from Vivo Y27s.