My Tablet does'nt open or turn on

I've been excited that my classmates have a higher version of Android, They asked me if what is my Android Version. Then I saw my version that it was old. its 4.4.2 then after that they have told me to try to check for updates in the settings. So there, I saw a update then it says Do you want to Update It Now?, Then I choose Update Now. Then my tablet starts to shutdown and it brings me to Android Recovery System. After that I tried to Reboot my system and reboot it but it still brings me back to android recovery system, After that I was tired, so i left it and i sleeped. when i woked up it doesnt open anymore.. but I left it charging for 2 hours

PLS HELP ME I REALLY LOVE MY TABLET.

PS: I ALSO TRIED TO RESET BUT IT STILLS BRINGS ME TO ANDROID RECOVERY SYSTEM