Talk:Summer 2019 Event/@comment-26790385-20190913095052/@comment-5380363-20190913105900

You can ALWAYS FAIL at equipment upgrading. It's just very unlikely  at Lv1-4. You start getting failed upgrades from as early as 5+. At 10 stars, you're more than ever likely to fail. You've just been through a very lucky streak upgrading 10 star gears without failing.