Problem with my Galaxy Tab

Hi! I searched all over the web, and no one has had a problem similar to this, so I decided to post it in hopes someone can help.
So yesterday I found my tablet (SM-T210R) and went to recharge it. It worked fine. I noticed that there was a firmware update, so I went to install it. Everything was normal until I hit 93%. The Android guy fell down and over it had a red triangle with an exclamation mark. The device then rebooted and did the same thing over and over and over. Turning it off and on didn't help. I tried to access the menu to factory reset it, but it didn't work, the update would override it or something. The only thing I can access was download mode, but my PC couldn't detect the device even after installing the Samsung drivers and Kies. So basically I'm stuck. My device was unrooted, so I dunno what is wrong. Help appreciated. Thanks!