Lightroom 5.2 will not import a Canon CR2 picture from my Canon EOS Rebel XSi
If this is the camera model you are refering to, EOS 450D (Digital RebelXSi/ EOS Kiss X2) then it is supported. Please give some more info about how you are trying to import, e.g direct from camera or card reader and what error message do you get if any.
I have this camera model and it has been supported by Adobe products for many years, already, including LR 5.2.
If your XSi CR2 files won’t import into LR, then something may have corrupted the files, or the process you’re using isn’t quite right.
As others have said, please give more details of the process you’re using, any error messages you receive, and if necessary, you can supply a CR2 file for others to examine, by uploading to http://www.dropbox.com and posting a public download link to a reply, here.