you can uninstall drivers by using Device Manager, follow these steps:
- Start Control Panel, click Hardware and Sound, and then click Device Manager.
- Expand the node that represents the type of device that you want to uninstall, right-click the device entry, and click Uninstall.
- On the Confirm Device Removal dialog box, click OK to start the uninstall process.
- When the uninstall process is complete, remove the device.
You can do this procedure for OWL in standard, and a second time for OWL in DFU mode.
You are now back to the original state.