After you unzip the firmware file, open Odin on your PC and connect the tab in download mode.
Should get a blue box with a active com port number showing that it is connected.
Select AP/PDA, depending on which version of Odin you are using, and navigate to the firmware you downloaded.
Once Odin is satisfied that everything checks out, press Start .
Tablet will reboot when flash is complete and you will see a green box with PASS if flash is successful.