Bafang BBS Programming Serial USB Adapter Cable

You can find the Bafang Programmer program online.

I've seen 2 versions of it. One which was found on the Luna Cycles website, and the other which was signposted on a Luna Cycles blog, to an updated 2.0 version developed by another person.

Once you have found the software, and got it running on a Windows machine, with the appropriate Serial USB port permissions in place, you can connect your controller up and make changes to the tuning profile.

Be careful everyone. You can easily break your stuff by messing this process up.

Controllers & batteries (neither of which are cheap) can easily be destroyed by using unwise settings.

Specifically be careful when changing "Low Cut Off" Voltage Limit, and Max Current. But the best thing to do would be to READ THE GUIDE. There are a few versions out there. Both are helpful.