Originally Posted by XXDroidZillaXX
This worked for me after getting the unauthorized triangle. Boot in to download mode and when it gives you the options to continue or restart phone, choose to restart. It bypasses a check or something.
Sent from my SCH-I535 using XDA Premium 4 mobile app
From what I gather, Download Mode does not do this anymore on 4.3 when you flashed older firmware than 4.3. No way to skip past that as you're stuck.
Sent from my SCH-I535 using Tapatalk 4
[VZW] Samsung Galaxy SIII