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Apr 30, 2015 7:56 AM in response to PhotographerJimby Drew Reece,Assuming you have already applied the relevant update that model should support internet recovery…
https://support.apple.com/en-us/HT202313
That should allow you to boot via the internet & get the original OS.
It's best if you use internet recovery over a wired (ethernet connection) since the OS & the installer will be downloaded, wifi can be unstable or slow in comparison.
Use cmd+alt+r at startup to get into internet recovery mode - it can take a little while, so retry if it fails to work first time, it should be clear that 10.7 will be installed when you boot correctly.
http://osxdaily.com/2014/12/14/reinstall-os-x-mac-internet-recovery/