I have attempted to contact the seller MANY times... totally ignored my questions, no response. I have contacted him/them for other things and they response quickly. In fact, I have bought other things from the seller and they have actually bought things from me.
I suspect they have dissected the EqualLogic firmware (embedded Linux) and removed whatever soft limitations Dell put into the firmware. People have reported doing the same thing, and they find the reference to the limitation, but it requires an SSL cert to decrypt the code so it can be modified. Lookie but no touchie.
Even as such, as big of a fan as I am for the EqualLogic products, I continue use them. I recently bought a PS6610E with (42) 6TB drives. My intention was to replace my (3) PS6000E's with 2TB drives with one array. I quickly found that the PS6610E very much disables anything but a Dell Enterprise drive... and not just that, but a very specific "Config Code 1341" drive. I have purchased several Dell Enterprise 6TB drives that have the same OEM Seagate model number, that the PS6610E refused to spin up. This pushes me, a previously dedicate EqualLogic fan, over the edge. It will be going up for sale directly and I will be buying Synology. I have a Synology array I got cheap and I have been continually impressed by the OS, features and resiliency. I'm leaning towards the RS4021xs+, but it seems way overpriced for what it is. I'll likely end up getting the RS2818RP+. My biggest concern about the Synology is lack of swappable, redundant, controllers.
I have a bunch of Equallogic firmware's that I can share with you. They aren't too new. Maybe a couple years old. But still. I don't give a crap, equalogic is EOL, they should be releasing this stuff for free now. Let me know.