Hi there. This might helps. Regards Sinumerik 840D sl: how to set access levels USER, SERVICE & MANUFACTURER, & how to reset them. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-NkX1U27BhGM.html
You can purchase it from Siemens 6FC52507AY007AG0 SINUMERIK 810D / 840DI SL / 840D / 840D SL; SINUCOM COMMISSIONING/SERVICE TOOLS ON DVD; SW-VERSION 7.7 HF3 SINGLE LICENSE