So I had this problem and and the solution ended up being pretty simple. After finding this thread along with other info I just followed the instructions in the OP of this thread
. I was on stock 4.4.2, which I acquired via a regular ole OTA, and attempted to downgrade without doing any research (mainly because I had downgraded before with no problem, but it had been a while). So I got the "
System software not authorized by Samsung has been found on your phone.
So if you got the "System software..." message, it's probably because before you tried to do whatever it was you did (probably trying to flash to a version below 4.3...maybe it was something else entirely? I don't know you) you had 4.3 MK2 or 4.4 NAE through OTA and, therefore, had the Knox bootloader. The solution for me was to ODIN flash a .tar of the version I was on before I bricked the phone.
Again, here's the link to the thread I followed with stock 4.4.2 NAE
. The OP warns that you'll get the Knox bootloader if you flash it, but if you have the "System software" problem, you have already have Knox. It will also wipe all data from your phone.
And the link to the directory
mentioned by the above poster.
So I posted this to summarize the solution to this problem...because I over-complicated it and took a while to figure it out. And hopefully to make search results of the problem easier to find.
Summary of the summary: ODIN flash a TAR of the version you had before things went awry; there are basically only two choices: MK2 and NAE. Hope this helps