Now you can get the same upgrade for only $80 remotely. Please check:
https://more4motion.com/products/swallowbot-upgrade-service
Software solution to increase maximum speed to 14+mph (with regular tires) and up to 17 mph with off-road or hybrid tires. Below are major features of the SwallowBot upgrade:
This speed increase solution is made for Segway miniPRO and Ninebot S.
UPDATE: With the latest release of the SwallowBot firmware, we are happy to announce it is now compatible with GoKart Mode for miniPRO.