This hoverboard doesn't have any unlockable upgrades.
Beelzebook is a limited hoverboard in Subway Surfers. It is a limited hoverboard 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 can be unlocked with 180.
The Beelzebook is a green book with teeth as the pages, the red bookmark sticks out making it look kinda like a toungue.