I have the on nxt 16 GB variant launched in January 2018 but it has August 2017 security patch.while the j7 2016,the j5 2016,on5,on5pro these phones which were launched in 2016 and 2015 respectively has got February security patch. If on nxt does not get security patch within the next month then i will never buy a Samsung device anymore and buy phones of other company like Xiaomi which gives true value for money.
Thanks for reaching out to the Samsung community! We do apologize for the inconvenience caused to you due to delay in the release of security patch for your device. We would be unable to speculate on updates released, as updates are created by Google and released to manufacturers to ensure compatibility. To check for updates on your device, you can go to settings and tap software update. Be sure to hit ♡ when you find an answer that works for you.
For Further assistance, you can get in touch with us via Live Chat option by following- http://livechat.support.samsung.com/Customer_new/IN. You can also connect us via Samsung Members web community by following mentioned url-https://community.samsungmembers.com/en_IN#/
