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:

Step 1
Check if your bike is running on the right firmware (1.6.8 or higher).

Step 2

Leave your PowerBank plugged in and turn your bike off by pressing the power button on the bottom of your top tube once.

Step 3

Check if your PowerBank is turned on. If not, turn it on by pressing the PowerBank button.

Step 4
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.