This hoverboard doesn't have any unlockable upgrades.
Thunderbolt is the thirty-first limited hoverboard in Subway Surfers. Like any other hoverboard, it protects you from crashing for 30 seconds. When crashed, it needs to recharge for a few seconds before it can be used again. Like most of others limited hoverboards, Thunderbolt costs 50,000.
It has the appearance of a baby blue cloud with two lightning bolts on both sides of the cloud.