Brick

I had an unbranded tablet with android kitkat (rooted) but one day when i rebooted it got stuck on the boot loading page and i came to know it was bricked. Please tell me.how can i unbrick an un branded tablet/mobile. I took it to many it experts but they were unable to help me so i turned to xda forums as an alternative. Though i had to throw it away and buy a new cell phone but i would still like to know a method to unbrick an unbrande device so i don't have to worry when i root my current phone
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