Dev servers are now available to update ChromiumOS special builds. Starting at version R45-7216, both x86 and amd64 versions are available.
Please test and feedback!
To update, get to command prompt (Ctrl-Alt-T), then enter shell as normal. Then issue the following commands:
For amd64 builds
update_engine_client --update --omaha_url=http://chromebld.arnoldthebat.co.uk:9080/update
For x86 builds
update_engine_client --update --omaha_url=http://chromebld.arnoldthebat.co.uk:9090/update
As ever, this update will overwrite any customisations you may have done (such as flash and API_KEYs). Please backup beforehand!
Happy updating!