Odin3 is an application that is used to flash.
Add the downloaded firmware file to AP/DPA. 14.4 is available to all software users as a free download for Windows. Reboot device in Download Mode (hold Home + Power + Volume Down) Connect device and wait for 'ID: COM' to turn blue in Odin. After successful process you will be able to see the "Pass" message with green label in Odin surface. Previously for old models you would just flash a single ROM file to AP/DPA (as described on the Upto link.Yes, don't use your device until the process is ongoing Yes, this will take few minutes so sit back and wait until the process is over. For that, you should download the Samsung Odin 3.14.4 software on. Now for start firmware flashing process you can click on the "Start" button. You can use this Samsung Odin tool with your computer to flash your Samsung Galaxy device.Be careful, At this stage you only need to select the "Auto Reboot" and "F.Reset Time" Don't change others.