I am not an expert . Try flashing your stock rom using odin
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so i followed instructions from here(i couldnt find a stock image so i found another root image): forum.xda-developers. c o m/showthread.php?t=1885558 and it made my tablet work rooted (Had this annoying popup though and thought installing the custom bootloader will help) but when i installed the bootloader it wont turn on at all.
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