Ah, that sucks. Well, I still have two more shots with 11.2 and 11.4 -- I'll try 11.4 and then 11.2, hopefully one of them will do the trick. Unfortunate that I no longer have my NAND backup.
And yes, 11.5 is the very first one I tried.
I guess I'll try to see if I get some use out of the 3D...