It will either be with another 3DS, another Wii or another Wii U. They all work.
It won't be a simple 'fix' like with LocalFriendCodeSeed_B where you have to drop the file in NAND, it'll have to be another A9LH payload like this.
If the 3DS actually appears to be able to sign CTCerts, you won't need another console, because the server doesn't check the DeviceID or the Device-Cert to see if they're real or not, they just need to match with a signature in the file.
Either way, you'll have to wait a while for more info to be released.