I ran into a similar problem last night trying to return my phone to the stock VRALJB software using the instructions in the "Return to 100% Stock" thread (was on the newer software from the recent OTA update). Using any of the firmware listed in that thread or linked at XDA, Odin would always fail at "NAND Write Start" leaving the phone stuck with error "Firmware upgrade encountered an issue". I tried all the troubleshooting steps, but nothing worked. The only thing that did was to use the Stock Rooted ROM firmware in this thread:
http://forums.androidcentral.com/ve...how-vzw-gnote2-root-rom-via-odin-w-video.html
Edit: it's the Root66_VZW_stock_system.7z file. Be sure to unzip it using 7zip then flash it via Odin. After flashing it be sure to follow the last instruction to wipe cache partition.
Also forgot: you should be able to get the phone back into download mode; first unplug it from the USB cable and ensure it's powered off. Next simultaneously press and hold Volume Down/Home then the power button until you see it say "Warning!!" at the top and a tiny yellow triangle at the bottom. Then press the Volume up button to continue which should take you into download mode where you'll see a green Android. Then you can launch Odin and connect the USB cable and proceed flashing the firmware.