A few important tips for people bringing a non-cloud edition back to life with drives larger than 2.1TB (e.g, 3TB, 4TB, 5TB, 6TB, etc)!
You MUST upgrade to the 3.x cloud edition software, but it is not easy.
I built a boot USB following the instructions on the various boards, and the 3.x WOULD NOT INSTALL if I had installed 3.0TB drives (or any drive larger than 2.1TB, I assume)
I wrongly guessed there was a problem with the tgz file and ended up building a 2.x boot USB stick and restored the system with 2.x, and that worked. Or so I thought. Every reboot caused the RAID-1 drives to rebuild. The 2.x version "sort of" recognizes the 3TB drives, which is BAD NEWS. When I plugged the drives into a Linux machine, it saw them as 800GB, which is typical for a misunderstood sector size.
To make a long, long, LONG story short, after days of pounding my head against the wall with lots of things SORT OF working, here's what worked.
Since the older ix2-200 has a BIOS which cannot cope with 3TB (or > 2.1TB) drives, you need to install smaller drives long enough for the FIRST BOOT of a 3.x "cloud edition" USB. In my case, I had 2 250GB drives I threw in (for the record: I used a 2GB "JD Secure" Lexar USB which worked great.)
To add insult to injury: he first time, the decrypted tgz file needs to be in \emctools\ix2-200d_images\, but after the BIOS is upgraded in the first boot (which will only happen if the installed drives are 2.1 TB or smaller!), the new BIOS will look for the tgz file in \emctools\ix2-200_images\ !!
If the system does not shut down after the activity, the update didn't work. I had a lot of cases where the USB flashed like mad and then stopped, but the NAS remained running. That was always a bad sign.
You need a 2GB USB stick - I was able to install the 2.x firmware with a 512MB USB stick, but the 3.x firmware needed a 2GB stick. When I used the 512M stick with the 3.x firmware, it just booted over and over again.
I signed up just to write this. It was a painful process, but it did finally work.
With an older non-cloud the key is to START WITH SMALLER DRIVES until the BIOS is updated (first of two update runs with the 3.x USB stick)
The new drives can be put in for the second run - and at some point the updating firmware changes the name of the EMCTOOLS directory where it looks.
Good luck! THANKS to everyone who wrote a LOT of great tutorials on the topic, I thought I would try to give mach a little since the 3TB, 4TB, 5TB or 6TB drives that are relatively new and they are TRICKY, especially with the 2.x firmware that pretends to understand them but fails terribly.