May 2012 Samsung Series 3 Chromebox Stumpy support yes: choose mainboard vendor samsung
May 2012 Samsung Series 5 550 Chromebook Lumpy support yes: choose mainboard vendor samsung
These two might be possible to flash in system:
see http://www.chromium.org/chromium-os/developer-information-for-chrome-os-devi...
Hardware Preparation
Open the case You'll now have to disassemble your device (which most likely voids your warranty). Disable write protect You'll have to locate the Write Protect jumper and enable it. This will make the BIOS read-write so you can update it. Once things have been updated, you can undo this so your BIOS is read-only again. Reassemble the device Now that you've done toggled the jumper, you need to reassemble the device and power it up. Check the write protect Run crossystem and look at the wpsw_cur field; it should be 0. Plug your system in to be safe! For the Chromebook laptop, make sure the battery is charged, and the power supply is connected. For the Chromebox, try and plug it into a battery backup (UPS), and don't try this during a storm :).
see http://www.chromium.org/chromium-os/developer-information-for-chrome-os-devi...
for location of jumper
October 2012 Samsung ARM Chromebook Snow (aka Daisy) November 2012 Acer C7 Chromebook Parrot January 2013 Lenovo Thinkpad X131e Chromebook Stout February 2013 HP Pavilion 14 Chromebook Butterfly February 2013 Google Chromebook Pixel Link support of all 5 yes: choose mainboard vendor google
Now what is with the other five? Here it looks like information of chromium.org stops: http://www.chromium.org/chromium-os/developer-information-for-chrome-os-devi...
Do the other chromebook have write protect jumper as well?