
A Reddit user has shared a screenshot of the notification he received on his device. It calls on him to backup the device's data, power down and “surrender your Galaxy Note7 unit.”
This didn't happen because there's something wrong with the Galaxy Note 4 which happens to be two years old, it received this notification because it's actually flashed with a Galaxy Note 7 ROM. Flashing refers to the act of replacing a handset's firmware with another version manually. This is something that enthusiasts normally do and in this particular case it involves changing the build.prop name to the Galaxy Note 7 in order to spoof the systems.
Now that recall notifications are being sent to outdated devices running the Galaxy Note 7's software this goes to show that Samsung's systems are unable to distinguish between the two. It's not ideal for Samsung since it's apparently unable to properly identify legitimate Galaxy Note 7 units that are still being used from outdated handsets masquerading as the ill-fated flagship.