Error 20 or 21 can occur when you reset your bike while using the PowerBank. It’s easy to solve by following the steps below:
Check if your bike is running on the right firmware (1.6.8 or higher).
Leave your PowerBank plugged in and turn your bike off by pressing the power button on the bottom of your top tube once.
Check if your PowerBank is turned on. If not, turn it on by pressing the PowerBank button.
Turn your bike on again by pressing either one of the handlebar buttons.
If this error keeps showing up, please get in touch with our Customer Support team.