Thanks for the quick reply. I made several tests and they all finish with stall after installing on SSD and reboot.
I;E; with Catalina, I succeeded with the boot from USB, I've been able to create a partition and to copy the files (install) but after the reboot, I fall in the following traces
which all end with a Kernel Panic
The same if I try to install other versions.
I was wondering if the problem could come from the BIOS version or settings. I have a S/N wich ends with PRO-V23. I actually have the factory version installed and I could update bios if necessary to EC_VB1002 or EC_VB1003.
I understood that the EFI with the config.plist and OC folder was already functional for any U55 but if it is not the case (and I have to update the plist.config can you share some guide or tools?. Any suggestion about the cause of the error I am facing?
Best Regards,
M.ilan