Enabling Developer Mode on Asus Chromebox 3

Support
1

I have a Asus Chromebox 3 (CN65) that I bought off from eBay. It currently is not org-managed.
I would like to enable developer mode, in order to flash a UEFI compatibe firmware via mrchromebox.tech.

My problem is that after removing the write-protect screw, when I enter recovery mode, nothing happens when I press Ctrl+d. No prompt is shown, the display doesn’t change a bit. No confirmation screen is shown. I tried multiple keyboards, but it did not do any difference.
I tried pressing the recovery button as confirmation, but that did not do anything either.

Is this normal? What am I doing wrong?
What should I try differently? Should I do a factory reset, and retry?

2

it’s a firmware/keyboard compatibility issue, nothing you can do other than find one that works, or flash the firmware chip directly using a ch341a USB programmer

1 Like
3

Thanks for your help!
I will try my other keyboards too, and report back.

Thanks for your efforts in making all this possible!

4

My SUN Type 5 USB keyboard came to the rescue!
With that, the Chromebox picked up the Ctrl+d keypress, and showed me the confirmation prompt.
With that I was able to turn off OS verification!

Thanks for your help!

1 Like
5

chromeoson