This hoverboard doesn't have any unlockable upgrades.
Birdie is the twenty-ninth limited hoverboard in Subway Surfers. Like any other hoverboard, it also protects you from crashing for 30 seconds. When crashed, it needs to recharge for a few seconds before it can be used again. It has the appearance of a rainbow-colored feather. The board is a limited edition hoverboard, exclusive to Subway Surfers World Tour: Rio 2015. This hoverboard reappeared during Rio. Like most of others limited hoverboards, it costs 50,000.