Think if it is the same controller as my 905se then once controller is on and assist level is set then then hold the down key and the on key at the same time for a few seconds.
The LCD manual that Wisper gives out is totally useless - none of the functionality matches the list of button presses I have now obtained by scouring the web.
I completely agree Groover it's dreadful, I apologies for that. We are doing it ourselves now rather than relying in the manufacturer. In the mean time please see the help video on our website under SUPPORT. https://wisperbikes.com/support/tutorials/