I Can't Boot or My SM-T230NU (Samsung Galaxy Tab 4)

have a huge issue. My SM-T230NU (Samsung galaxy tab 4) won't move passed the loading screen. instead, on boot it stays on the Samsung screen. Now, im guessing i messed something up. basically, i went onto a PC and took EVERY file, (yes even the hidden ones) and moved it to my USB drive. then, (since i hadn't touched my tablet for a while, nothing happened to it, still good as when i stopped using it.) i came back to the tablet, and it wasn't working right. i let the tablet be all night a full 12 hrs and it didn't move from the Samsung screen. Then i began loading random ROM files onto the micro sd and i erased everything on there, all the data, factory reset the tablet, cleared everything from the micro sd card as well, and guess what! Nothing. nothing changed. then i thought, okay what happens if i put those old files back onto the micro sd card. NOTHING, again. i have tried calling samsung, best buy and all that and so far, no one can fix it.

The question, is what do i do?
Should i install something?
Get a new one?
Forget it and sell it?
What do i do?

Please if ANYONE can help me that'd be great! I Really Appreciate It!

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