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Does anyone have an idea of how to remove the back cover without damaging the phone? I know the battery wont last more than 1 or 1,5 years so i’ll have to change it at some point…

Nicolas Rancourt, go to this page. Scroll all the way down to Supporting Documents and click on the blue link. That will download the disassembly guide. Hope this helps, good luck.

Very easy to remove the back cover actually. Insert thumbnail/similar tool in between metallic strip on side and back cover and gently “pop” your way around. The back cover comes off like a very hard to remove removable back cover.