I have been having the same issue with Acer C740 factory reset image. I have also tried three different USB drives. Yesterday, I contacted Google Support. I was even sent a local image file. They were also unable to find a solution. We have a fleet of 1000+ Acer C740 machines and are down to 1 flash drive that works correctly. Our department has not been successfull at creating a second recovery USB since January 2017. I am able to create other recovery images for other Acer and NonAcer chromebooks with no issues. What is the next step? We have premier support with Acer. Can Acer send us a working recovery image?
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