This hoverboard doesn't have any unlockable upgrades.
Bamboo is a limited hoverboard in Subway Surfers exclusive to . 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. It needs 20,000 to be unlocked.
The Bamboo board is built with five long sticks of bamboo wrapped around the board to keep it's shape.