Default [Q] trying to re-flash IMEI, no succes

Hi guys,

I have an Samsung S3 Euro version, and I lost the IMEI during flashing.
I still have the number, the phone just doesn't know it.

From what I understood is I have to prepare a flashable EFS backup and restore the good settings.

I found this site:

However the *#7284# does not give me the qualcomm settings but the service mode menu.
This makes some sense, since it has the Exynos Quad CPU and not the Qualcomm Snapdragon S4

So I'm pretty much stuck here, does anybody know what to do?

Thank you.
HTC HD2 -> HTC Desire HD -> HTC Sensation -> HTC One X -> Nexus 5