mobile

Hi. I got the problem where I cant use my tab, because it just shows this message: Firmware upgrade encountered an issue. Please select recovery mode in Kies & try again.
It happened because I tried rooting my tab in Odin. At first it failed, I tried it a second time and it kind of lagged.. so being my stupid self I disconnected the tab and since then I have this problem.
I tried looking for some resolutions, but half of them either uses Odin:
1. which I really dont know how to use
2. which considers the tab being in download mode. My tab cant even do that.. when I hold the Power+home+volume down buttons, the screen goes black and then the same message comes back.
The second half of resolutions is with Kies. I didnt know about Kies earlier, so it doesnt have my tab details stored there.
I dont know if Kies has to have your tab stored to use the 'Firmware Upgrade and Initialisation' option, but I tried in anyway. When I write in my model, which is SM-T230NU, it shows that the model information I entered cannot be verified.
When I charged my tab a bit and connected to my computer, Kies isnt able to find it. It finds that something is connected, because it shows that it's connecting, but then it stops, then connects, and the same over and over.
Anyways, I have a Samsung galaxy Tab 4 7.0, model SM-T230NU, and I really want to try and repair it on my own before I give it to service.
Please dont hate on my stupidity, because I'm not really into technology..