Which version of Lightroom do you use?
Take a look here:
Here you can see which LR-Version you need to open the appropriate RAW files.
Another way is to convert the RAWs into DNGs with the DNG converter from Adobe.
You can download the program here:
Raw support for the Canon 5DII was introduced back in LR2.2, so unless you are still running LR1 you should be able to import those raw files. So, can you give us some details of what happens when you try to import them, and what messages are you getting?
Hi Axel and Jim,
Thanks for the answers. I am using lightroom 5.7 (for Windows) and i justed checked if there was an update, but there isnt.
Lightroom 5.7.1 is the last in the version 5 series. There are no further updates.
As Jim said, this is not an issue with your version of Lightroom. Something else is happening. We need more information.
As Jim asked: So, can you give us some details of what happens when you try to import them, and what messages are you getting?
What happens if you select "New Photos" near the top (Instead of All Photos).
Why are the images that can't be imported name FOTOxxxx.CR2 and the ones that can are named 14N_xxxx.CR2.
Yeah, I was wondering about that. Makes you wonder if a couple of different cameras have been used. IIRC, the 5D2 doesn't allow the default naming scheme (IMG_xxxx.CR2) to be user-configured (unlike the 5D3 and presumably the 5D4), so either the files were renamed prior to import or they're not from a 5D2.