Error code 25 (machine beeps 2 times and then 5 times) is a hardware error in most cases. It is caused by an engineering error on the way how control board is designed. It happens due to resistors burning out. Unfortunately the solution is to replace a control board.
If you use Segway miniPRO or Segway miniLITE with handlebar you are aware that so called "self-balancing" feature does not work when you install a handlebar.
We have developed and made a simple and elegant solution to bring self-balancing back.