seems you need to re-init download mode before any additional heimdall commands. many times I tried to download-pit after failing to flash, and got ERROR: Protocol initialisation failed!
but after turning it off, holding volume down, and holding power-on for about 10 seconds or so, I got the Downloading... screen again, entered sudo heimdall download-pit --output /tmp/vz.pit --verbose --no-reboot, and it worked. it's a binary file, but less will show you enough of what you need to see. print-pit would have probably worked as well.
now I'm trying to reinstall the factory ROM using information here.
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last updated 2015-10-14 22:47:33. served from tektonic.jcomeau.com