after factory reset yes (but you will loose your flash) after firm upgrade no,but i disabled firmware upgrade via duu so people wouldn't screw up there devices.there isn't any firmware upgrades anyway for a long time now,but i assume you mean firmware reload.its still reloadable via partition (dfs) but not via duu.the logic being people that paid for dfs probably know more what they are doing than people who dl free duu from forums or web.
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