This isn't the right place to ask this kind of question as this is the chromium os developers mailing list.
Make sure you are properly putting the recovery image on the usb drive with the program it tells you to use
https://chrome.google.com/webstore/detail/chromebook-recovery-utili/jndclpdbaamdhonoechobihbbiimdgai
Then follow the instructions on googles site
"What you need to do
To recover your Chromebook, you'll first create media with the Chromebook recovery app, then reinstall your damaged Chromebook’s operating system.
Install the app on the working computer (not the Chromebook with the “Chrome OS is missing or damaged” error).
Open the app and follow the on-screen instructions to create the recovery media.
Insert the SD card or USB drive you’ve created into the Chromebook you want to recover.
Follow the on-screen instructions."
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