OK well just thought I would throw this in there from the "OTHER SIDE of the tracks " so to speak . And I don't get any joy out of giving anyone negative info but I DO like calling people out , who like to leave people in a more confused state.
Here's what I have learned from my 15years with Samsung phones ( and it's a marriage of convenience believe me )
Almost any data can be recovered from an item with a hard drive of sorts . It just depends on what level we are discussing. I you are under the thumb of the government or investigated for immoral images and pictures , you better believe that there is a way to get those back .just like a PC hard rive , if you format it IT has the quick way and the advanced way which can take several hours ( just In that example the difference in time should explain the depth of the cleaning) phones aren't PC s but I think you can see where I'm going with it. Now if you are selling or giving away, still pretty sure MOST parties would not be able to recover. And actually I find it wild that the other reply suggested you REMOVE YOUR GOOGLE SAMSUNG ACCOUNTS , because when they are not , and you factory reset , they BOTH make it nearly impossible to USE the tablet at ALL . THATS what they were designed for as extra protection , so I am stumped as to why they chimed in with that . But here's the other mention, just so you have a solid piece of mind ( and maybe a tad OCD etc which would keep some thinking long after about it ) IF YOU are desposing of the tablet as its had a long good life , best thing is , take it out back get a power tool or hammer etc and make sure NO ONE will even recognize it as a tablet and gthrow it in an e-waste bin and THERE U HAVE IT .
HOPE I HELPED A TINY BIT ATLEAST
And remember, whatevera a man makes a man somewhere can unmake it .
