https://medium.com/@gavinmdonald/upgrading-an-unsupported-galaxy-to-android-pie-444bff4ceac6

Gavin McDonaldBlockedUnblockFollowFollowingDec 30Before we begin this has been written for a Samsung S7 but should be very near exactly the same for all Samsung devices, and very very similar for others.

If phones could talk all you’d hear is tales of neglect and abandonment. Our phones quickly become obsolete with new hardware iterations and operating system updates annually. Usually our phones make it to two years before they’re abandoned and no longer supported with shiny new updates to increase their longevity. It’s not that these devices are so outdated that they can’t handle it, it’s purely an attempt by phone manufactures to push their latest, expensive hardware iterations on you.