Still no solution for non 5D3-users, right? 
If there is a method you guys want me to try, I still have the 1000x and 1050x 128gig cards KomputerBay sent for me to test.
Heres the thing, there are 2 users, both based in europe that "got it to work" with their 5d2, I think one of them posts here, I even contacted them via email and their youtube accounts.
But despite their help I can't replicate their success.
Here's what I got from them;
They have the 128 1000x CF from KB
They are using older builds, Jul 14 and Jul 22
One is Using Win 8
One is Mac
They both say they did not do anything "special" and just followed the install process online.
On my part,
I tried to install the ML to the CF via PC win7 and Mac- no go.
I tried to wipe the parttition and made new partition of varying sizes before format via a windows utility to fat32- no go
I tried making the CF bootable via EOScard - no go
I tried cloning a CF card with ML that works to the 128 card including cloning the partition - no go
Gregoryofmanhattan dev for the 50D ML says he got it to work on the 50D but I don't know if he can advice us on how to get it to work on 5d2. Hope he can chime in.
So I'm wondering, are those 5D2s in europe made differently?
Are those KB cards sent to the 2 in europe made differently?