Since Google’s Chromebook Recovery Utility doesn’t always work ;-{
Here are some more ‘manual’ steps to ‘starting over’ :
1) Find your image here
Look for your model device
2)Use any img writer utility to create USB or SD *Iused the raspberry PI img writer..any should work fine. Some of the img writer’s default to only .img; just change to all filles and use the .bin downloaded from above.
Worked like a champ!