read on the interwebs that it could disable FW write protection
Well, since my chromebook only has 32 Gigs of memory, it is not suitable for Windows. So I gave it up.
But thanks for you help anyways 
Same problem, with same message
EC result 4 (ACCESS DENIED)
Write-protect is enabled or EC explicitly refused to change the requested field.
Error setting new SSFC value; if HW WP is enabled, please disable and retry
boot a Ubuntu live USB is the easiest solution, the problem is that ectool is missing some libraries it needs that your distro doesn’t include by default
Ok, how install ectools correctly ?
there’s nothing to install. The script downloads the ectool binary if needed to set the touchpad type in SSFC. ectool is compiled against some shared libraries, which if missing will cause it to not run / cause the script function to fail.
I try with Live CD Ubuntu, Lubuntu, Xubuntu, Fedora and Debian, but same problem, I installed Lubuntu in the laptop and same problem,suggestions?
run ectool from the command line after the script function fails, note what packages are missing, install them manually, then re-run the script function