You should be OK with 4.2, anything above this is not clone safe, unless it's been patched.
But do not do any aoftware updates on the Gemini image, it might download the clone killer code in an update. I've never used Gemini so im not 100% sure..
Personally I would say avoid Gemini images altogether, they are nothing special anyway, Nabilosat and Pli images are better in my opinion.