This hoverboard doesn't have any unlockable upgrades.
Hexed is the forty-fifth limited hoverboard in Subway Surfers, and a limited hoverboard exclusive to Subway Surfers World Tour: Transylvania 2016. Like any other hoverboard, it protects you from crashing for 30 seconds. When crashed, the hoverboard will explode and need to recharge for a few seconds before using again. Unlike most of others limited hoverboards, Hexed costs real money.