Odin is not needed, also no special skills needed. All you need is a PC with Samsung Kies installed.
Kies is best to be updated to latest version. latest one is 08-01-2013
So, let's start. If you were rooted and the custom binary counter has increased, please use TriangleAway prior to this guide.
1-) Open up Kies with phone disconnected, but keep it powered up cause you will need it for the serial number.
2-)Navigate here (tools) (picture 1) and select the 3d option (software upgarade and preparation). you will get this Enter GT-N7100 press confirm.
3-) enter your phones serial number(picture 3) wich you can find either under the battery or by navigating to yout phone Settings- About device- Status- Serial
Number. Press confirm. after pressing confirm you will be presented with a dialog which lets you know that the device will be wiped. Press Confirm again.
4-) you will now be presented with the version (picture4, it is for my phone. you will have maybe other) that is the latest for your phone and your serial number. press confirm and wait for the first download (picture5). wait till it finishes.
5-)in the next screen (picture 6) read and select Agree. put your phone in download mode by pressing volume down+ home button+ power on. do not release the buttons till the phone is in the screen that tells about warning. press volume up.
connect phone to PC and press down at Start Update button.
this will take a while to download cause the update is about 1GB.
wait till it finishes and phone boot up.
Set up as usual.
Hope it helps.