John Bumpus

Thanks for the advice Nealh. I thought I had tried all known button combinations without success. However after scouring the internet I cam across a slightly different display that obviously uses the same chip logic. The main difference was that my user guide, and all the others I could find for the LCD880, says "After power on for 5 seconds hold both the up and down buttons at the same time". That never worked for me and its now clear that it should say 'After power on within 5 seconds'! That works fine to get into the settings. Interestingly, (perhaps) the default settings were for 20 inch wheels and 75 kilometres p/h max speed!

If you meant LCD880, I just bought a replacement LCD880 for my Zipper4 from https://www.electricbicyclefactory.com/shop/ Surprisingly it went smoothly and the controller arrived in 4 days. As a surprise bonus I now have a throttle control and cruise control. As I can't fathom how to get into the settings they will probably remain.