To restore conversations on GB WhatsApp, you need to have a backup of your chats. First, ensure that you have a recent backup saved on your device or Google Drive. If reinstalling GB WhatsApp, download and install the latest version. During the setup process, verify your phone number, and when prompted, tap "Restore" to retrieve your chats from the backup. If the automatic option doesn't appear, manually copy the backup file from your device's storage (GBWhatsApp > Database) to the appropriate folder. Once restored, your chats and media should be available as before.