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Astronaut

Unauthorized, custom android installed

Google says I'm using custom android Os on Galaxy J7 Crown (SM-S767VL). Phone says I'm running 9 (pie). Almost positive it came with 8.1 (oreo). I don't remember an update stating 9 (pie) was going to be installed. Ever since I noticed i was using 9 Os im seeing long on's from a samsung pad device, linux device and RCA device. Changed to Jay7 on carrier. Still usually device not recognized or listed as J7. How bad an I hacked ? Can i install 8.1 to fix ?