To start with, I'm flash addict and always trying to flash new roms/firmwares. However after flashing one of the newest samsung firmware i got this little red exlamation mark:
I have tried to reset flash counter in a lot of ways but it always stayed at number "1" (After you reset with triangle away latest, opening app again shows 0 flash counter but after reboot it increases to 1). Even if my flash counter was 5, after reset it was staying with 1. Seems that samsung introduced some security improvements against reseting flash counter for galaxy s3.
But one xda member InsteadWoolf published solution to reset flash counter:
1- Reset via Triangle Away
2- Turn off phone and go to download mode.
3- Then flash via odin pc the stock firmware you want.
After this method flash counter is 0. However if you go for custom rom or not stock kernel, that red exlamation mark comes back and flash counter increases to 1.
BIG CREDITS TO InsteadWoolf