The stock firmware for the Galaxy S3 that is headed to Verizon, SCH-I535, has been released over at Samsung Updates. It appears to be flashable via Kies, but if this doesn’t end up being the final software, then it may not do you much good. It’s never a bad idea to have original stock firmware tucked away in a back folder on your PC though. The file is roughly 779MB and can be grabbed at the source link below.
Via: Samsung Updates