You will have to install and run Chrx, which is really easy. If you don't want to that, you can just go into guest mode. Since starting Developer mode wiped all your data, you will have to log in again, etc. Your computer will restart and say 'OS VERIFICATION IS OFF.' Press control-D. Then, you can perform a reinstallation of Chrome OS following the wizard. When you see the Chrome OS is missing or damaged screen, you need to insert the USB drive to the device. After that, press the Power button to boot the device into recovery mode. Modifier keys like esc, enter, shift, ctrl. Power on the device and then hold Esc + Refresh on the keyboard. You will be greeted by a very scary popup saying 'CHROMEOS IS MISSING OR DAMAGED.' Hit control-D, and then it will say something along the lines of 'START DEVELOPER MODE? all your data will be wiped.' press enter. Problem After using my Dualboot Acer Chromebook CB3-431 in ChromeOS, the ability to boot into Linux (GalliumOS). To turn on developer mode, hold down the esc and reload key, then tap the power key. (APKs, or android packages, can't be opened without developer mode.) It's not on by default because it also makes it easier to install a malicious package. This post is about how I got my chromebook dual booting galliumOS.ĭeveloper mode is a setting that lets you do development. I recommend reading through all of this post before starting. Note: to do this, all your chromeOS data will be wiped.