Sensible to do some research before hand, especially when the creator of the app doesn't care about the warranty.
So far I've only seen one person modify using app and had to return to service centre and work was refused because motor had been modified.
I'd like to hear if anyone has used the app put it back to normal and still been able to get there bike serivce but can't seem to find them so thought I'd ask on here as an ebike forum.
If these sort of questions bore you, maybe don't read the threads