Combatible firmware for old S7
SM-G930FD and SM-G930FD are all models of the Samsung Galaxy S7. See Samsung Galaxy S7 Specifications.


  Versions: G930F (Global); G930FD (Global; Southeast Asia); G930W8 (Canada)



On the Misc section of the above link:


  Models:   SM-G930F, SM-G930A, SM-G930P, SM-G930V, SM-G930T, SM-G930R, SM-G930F, SM-G930FD, SM-G930W8, SM-G930S, SM-G930L, SM-G930K, SM-G9300


For firmwares, you can verify here for G930FD and here for G930F. Check if your country is among those with new firmwares.