Restoring data on GB WhatsApp can be tricky, especially because it's a modified version of the official WhatsApp app and doesn't always support official backup and restore methods. However, here's a general guide on how you might be able to restore your data:

*1. Restore from a Local Backup:*
If you have a local backup saved, you might be able to restore it by following these steps:

1. *Locate Your Backup:*
- Open the file manager on your phone.
- Navigate to *GB WhatsApp > Databases* or *WhatsApp > Databases* (depending on where your backups were saved).
- You should see a file named something like msgstore.db.crypt12 or with a similar format.

2. *Reinstall GB WhatsApp:*
- Uninstall GB WhatsApp if you haven't already.
- Reinstall the same version of GB WhatsApp.

3. *Restore the Backup:*
- During the installation, after verifying your phone number, GB WhatsApp should automatically detect the backup and prompt you to restore it.
- Select *Restore*.

*2. Restore from a Google Drive Backup:*
GB WhatsApp typically doesn't support Google Drive backups, but if you've switched back to the official WhatsApp temporarily and made a Google Drive backup, you could restore that to the official app and then switch back to GB WhatsApp. Here’s how:

1. *Restore on Official WhatsApp:*
- Reinstall the official WhatsApp from the Play Store.
- Verify your number and choose to restore from Google Drive.

2. *Backup Again Locally:*
- Once restored, you can create a local backup by going to *Settings > Chats > Chat Backup* and choosing *Backup to local storage*.

3. *Switch to GB WhatsApp:*
- Uninstall official WhatsApp and reinstall GB WhatsApp.
- GB WhatsApp should detect the local backup and prompt you to restore it.

*3. Using Third-Party Recovery Tools:*
If you didn't make any backups, you might try third-party recovery tools that can scan your device for deleted GB WhatsApp data. Some tools you might try are:

- *Dr.Fone - Data Recovery* (by Wondershare)
- *Tenorshare UltData*

These tools often require a PC and may or may not be able to recover your data, depending on various factors like how much the data has been overwritten.

*4. Check Cloud Storage:*
If GB WhatsApp had an option to back up to any cloud service (like Dropbox or Google Drive) and you used that, check there for a backup.

*Note:* Be careful when using modified apps like GB WhatsApp, as they can be less secure and not as reliable as the official version.