Restoring GB WhatsApp data can be challenging because it's a modified version of WhatsApp and doesn't always support the same backup and restore features as the official app. However, you can try the following steps:

1. **Backup Restoration:**
- **Local Backup**: GB WhatsApp typically creates local backups in your device's storage. If you have a backup file, you can restore it by copying the backup file to the GB WhatsApp folder in your internal storage.
- **Google Drive Backup**: GB WhatsApp doesn't natively support Google Drive backups. If you had created a backup using GB WhatsApp, it would likely be a local backup.

2. **Reinstallation**:
- Uninstall GB WhatsApp from your device.
- Reinstall GB WhatsApp.
- When prompted, choose the option to restore from a backup during the setup process.

3. **File Transfer**:
- If you have a backup file stored on your device, ensure it's placed in the correct folder (`GBWhatsApp/Databases`).
- Reinstall GB WhatsApp and it should detect the backup and offer to restore it.

**Note:** Using modified versions of WhatsApp can be risky, as they may not be as secure and may not handle data in the same way as the official app. It’s also worth considering transitioning to the official WhatsApp for more reliable data management and security.