Samsung-Galaxy-S3-Mini-I8190N-Official-XXALL6-Android-4-1-2-Jelly-Bean-4-1-2-Jelly-Bean-Firmware-Download

Press and hold Volume Down + Home + Power key till the device turns on and you see the Android logo with a triangle
Press Volume Up key

USB drivers installed on your computer
Extract I8190NXXALL6_I8190NOXAALL6_DBT.zip, you can get some .tar and .pit files
Extract Odin3 v3.04, you can get a windows application named Odin3 v3.04.exe, and run it
Turn off your phone, and go to Odin Mode
Connect your phone to computer
You can find the message �Added !!� under Odin�s message box
Now select the files that you have to flash on your phone in Odin:
     Click on PDA and select file with CODE in its name
     Click on Phone and select file with MODEM in its name. Ignore it if there is no such file
     Click on CSC and select file with CSC in its name. Ignore it if there is no such file
     Click on PIT and select the .pit file. Ignore it if there is no such file
In Odin, for the Re-Partition option, check it Only if you selected a .PIT file. and do not change any other
Click on the Start button in Odin
Waiting for installation
Your phone will reboot after the update is completed
Done