I am using the most recent one on their website (the links I provided).
Here's what I did (Mac OS):
* turn board on to fastboot mode (./fastboot devices shows the device is detected)
* sudo ./flashall to run the bootloader script
* flashed boot, system, userdata, recovery, persist, and cache images
* reboot board
After unplugging it, removing the microUSB cable, and plugging it back in, the board doesn't start up (it's cold, no LEDs, nothing on the monitor). I left it plugged in for 10 minutes, unplugged/plugged in again a few times with no luck. I also tried to start the board up in fastboot mode again but that didn't work either. But I was able to start the board up with an SD card boot (S6 to 0100) and flash the Android OS with a microSD card
I hope this helps. Let me know if you need to know anything else or something wasn't clear.