Don’t worry, you most likely haven’t broken your light…we hope.
Try deleting all modes and add just the ‘High mode’ and hit the upload button. If the light turns on and operates with just this mode, now try reprogramming the light with your preferred modes or reprogramming the default modes.
If this is no use, please try an alternative port on your computer, or an alternate computer altogether. Ensure the battery is fully charged, and if it is a PWR light, that you don't have more than one PWR device plugged in at one time. Retry programming with just the 'High mode'.
If after all of this you’re still having trouble please get in touch via our contact page.