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Greeting, and Welcome to the Forums! I think it would help all of us here if you would make the question a little clearer, but Ruby's right- updating the app itself likely won't make you lose anything. If you're upgrading a weapon, it won't either. I'm pretty sure none of us have seen this happen, unless the developers have a legitimate reason to delete your progress.
You're Welcome ^_<Hi Ruby,
Great - and thank you for a very quick reply!