This hoverboard doesn't have any unlockable upgrades.
Rose is one of the hoverboards in Subway Surfers. It was released in the Subway Surfers World Tour: Paris edition. Like any other hoverboard, it will protect you from crashing for 30 seconds. When crashed, the board will explode and recharge for a few seconds before it can be used again. It has no special ability. The hoverboard has a print of a rose on it while the background is the French flag.