hoo at last 1st update after Android 7.0 ....so Samsung what's new in this ....haaan we need a strong reply

Samsung are you sleeping, No software updates since Android 7

hi am Rajesh am using S7 edge I've updated to nought one month ago but now when I go for software updates it shows "the os in your device has been modified in an un authorised way " What should I do , please suggest and write some advices