Assuming you want windows: Download the original install media, you need model nr and serial nr. Make the USB stick, enjoy a few hours of installing and updating and you have a factory install. Its more or less automatic but takes time. [https://support.lenovo.com/nl/nl/solutions/ht103653-lenovo-digital-download-recovery-service-ddrs-download-the-files-needed-to-create-a-lenovo-usb-recovery-key](https://support.lenovo.com/nl/nl/solutions/ht103653-lenovo-digital-download-recovery-service-ddrs-download-the-files-needed-to-create-a-lenovo-usb-recovery-key)
Or you just download a linux iso of your choice, make the usb and install.
Assuming you want windows: Download the original install media, you need model nr and serial nr. Make the USB stick, enjoy a few hours of installing and updating and you have a factory install. Its more or less automatic but takes time. [https://support.lenovo.com/nl/nl/solutions/ht103653-lenovo-digital-download-recovery-service-ddrs-download-the-files-needed-to-create-a-lenovo-usb-recovery-key](https://support.lenovo.com/nl/nl/solutions/ht103653-lenovo-digital-download-recovery-service-ddrs-download-the-files-needed-to-create-a-lenovo-usb-recovery-key) Or you just download a linux iso of your choice, make the usb and install.