Herve, that worked perfectly!!! I was able to install in two machines E6220 without any issues. I had opted to High Sierra + Clover + your EFI package. There is only one issue regarding the boot. I installed Clover in the HD and copied back the EFI folder, etc. However, every time I boot the system I get stuck on the Apple screen logo even before it starts loading.
I accessed Clover boot options and added a -v, and that worked. Without -v it freezes, with -v the boot process works fine.
Weird right? -v is just the verbose mode, I'm not really changing any config parameter!!
Any thoughts?
Thank you for your help.
Mario.