I am using Galaxy J7 DUO. Last update I got was J720FDDU4BSG7 on 26 July 2019. After that I didn't get any update, though Samsung released 3 system updates in the last 9 months. The updates are J720FDDS4BSI1, J720FDDS5BSL1, J720FDDU5BTB5 . One of my friends using same device J7 DUO. He got all of these updates. When I check updates in my phone, it shows my device is up to date. What should I do now ? Please help me.