Here is a full guide on how to unroot and back to official stock firmware for Galaxy SIII Mini GT-I8190. It is useful also if you soft brick your phone
!!!BE SURE THAT YOU FLASH THE RIGHT FIRMWARE FOR YOUR VARIANT!!!
Do it on your own responsibility! if you follow this guide properly u will be on the safe side 
Before we proceed, make sure:
1-You have installed your Samsung Galaxy SIII Mini GT-I8190 USB drivers on your PC (the easiest way is to install Kies).
2-You need to enable USB debugging mode (Settings>Developer options) which is deactivated by default.
3-Your SIII Mini GT-I8190 should have 70-80% charge remaining.
4-Your SIII Mini GT-I8190 should be factory unlocked.
5-Backup your important data like Call logs, SMS and other data stored in phone memory in case if anything goes wrong, your data is not hurt.
6-Make sure that kies program is not running & disable antivirus.
This guide is only for Galaxy SIII Mini GT-I8190. So don’t bother to try it on other devices.
How to do it:
Step 1) Turn OFF your mobile and go to Download Mode by pressing and holding the Volume Down + Home Buttons together for few seconds followed by Power button then proceed with volume up. (For some phones, when you see the construction Android robot and a triangle, press Power again to confirm to enter into Download Mode).
Step 2) Now open ODIN on your PC and connect your Galaxy SIII Mini GT-I8190 to your computer.
Step 3) Once your phone is successfully connected to your PC, the ID:COM box on ODIN will turn blue and will show the COM port number.
Step 4) unzip the downlowded file, u will get a Home.tar file.
Step 5) click on pda (in odin) and choose the file "Home.tar"
Step 6) check "Auto Reboot" and "F. Reset Time" options and make sure that "Re-Partition" is unchecked
Step 7) Click on Start button in ODIN window to start the installation process. The process will take few minutes to complete.
DO NOT UNPLUG USB CABLE WHILE EXECUTING THE PROCESS, YOU MAY BRICK YOUR PHONE!
Step 8) When the installation is completed, you read a "Pass". your phone will restart (first boot will take a longer time so don't panic) :good:
It is recommended to make hard reset after flashing to have a fresh official firmware
NOTE 1: If you flashed custom recovery when rooting, please restore your stock recovery, do it before flashing stock firmware: refer to tsy0n thread.
NOTE 2: If your phone stuck into a bootloop after flashing the firmware, take-off battery, reinsert it, boot in odin mode and flash "param.tar" (attached) as PDA.
NOTE 3: If you have a corrupted partition table, (Odin says: "there is no pit partition" or "Re-Partition operation failed"), flash pit file for your device (attached) (put it in pit window) with your firmware, in this case "Re-Partition" must be marked.
Odin troubleshooting: If Odin accidentally gives you "fail" try the following:
- Repeat procedure.
- Make sure that all actions of Kies are disabled from task manager.
- Change usb port.
- Try another usb cable (make sure it is the original).
- Try another Odin version.
- Uninstall and re-install driver.
- Try another computer.
Download Links:
Odin
Don't forget to press THANKS & RATING buttons!
THX to @mattiawhite for "param_I8190N zip"
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