Flashing firmware or changing product codes carries a risk of making the device unusable. Ensure you have a full backup before proceeding.
As with any legacy service tool found on third-party repositories, use caution. Many "download links" found on forums for this specific version may be bundled with adware or malware. It is recommended to scan any downloaded .exe file through a service like VirusTotal before execution. NSS Download - Used to unlock forgotten nemesis service suite nss v103815 download link