I went back and tried this again, same issue with just the two flashed. However, if I unmount the /data mount in between the 2 zips, it seems to take much longer to flash the last zip, no error like before, and still no joy. I have the 16GB version, so I was hoping not to use multirom but I can switch to mutlirom if this is not an issue you are wanting to tackle ATM. Thanks for helping and continuing the good work of getting this working on the hammerhead!