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I would charge it again and attempt several more factory resets before giving up. You said you "tried everything" to get something to work - it's possible that this and/or other factors have drained the battery prematurely.
When you do factory resets, you need to ensure the device is turned off first, no matter what the screen is showing, so slide and hold the Power button for about 20 seconds before trying the reset; then repeat the whole process in case you turned it on instead of off.
I would also try a different micro USB cable - it's the obvious first step when your device isn't being recognised by the computer.
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