FYI, unless you are on firmware 1.091 or 1.092, the option to add stainless steel will not appear.When you are connected to the mod by selecting the mod and then going to the page that looks like a big wheel and shows the stats of your vape, go to the settings page (the icon looks like a gear). At the bottom of the settings page select the "upgradation" option and that takes you to the page that allows you to purchase the upgrades.
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Sent from my SM-N910V using Tapatalk