ALPHA BUILDS – R78-12476.0.2019_09_29

New Alpha builds ready for testing!

These builds will not auto update but can be forced once the real R78 special version is deployed if desired.

When R78 special is ready, the upgrade process can be performed with the following command line after opening a shell prompt:

update_engine_client --update --omaha_url=

Build Details

  • Realtek rtl8192e wireless support
  • Realtek rtl8712 wireless support
  • Realtek rtl8723bs wireless support
  • Realtek rtl8188EU wireless support
  • Additional SOC sound card support
  • MediaTek MT7601U support
  • Added in various Wired Ethernet drivers support


Known Issues

  • Play Store does not work
  • The Google assistant does not work.
  • “This is the last automatic software and security upgrade statement” can safely be ignored since this will not prevent subsequent updates.


Please test and log issues on Ensure you tag the issue with the ‘Alpha’ tag as well as detailing the version of the build the issue was found in. When detailing the version, please use the tag with version of the build you are testing against. For example, for this build, use the tag: ‘R78-12476.0.2019_09_29’

7 thoughts on “ALPHA BUILDS – R78-12476.0.2019_09_29”

  1. I tried to update using the above command one, I get Update failed, current operation is UPDATE_STATUS_IDLE, last error code is ErrorCode:: k0mahaErrorInHTTPResponse(37)

    I’m currently on 60.0.3112.102 (Developer Build) (32bit)

    Any suggestions?
    Thank you,

  2. This is the ONLY place Ive found an image of any sort that includes support for the 8723b. Its an infamous wireless card by the looks of things. Will be giving it a go soon, thanks very much.

  3. I’ve got two questions:
    1)Why does my laptop boot only on build 69 or earlier? I try to boot the latest ones but it just gets stuck on ”booting image a” or b or the other ones.
    2) Is it possible for you to build a special build based on real chrome os and not on chromium os?

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