degrade OS CentOS 7.5 to CentOS 6.7 on HP 470 G7 Notebook

[mln_83]

Hy

I have deployed a CentOS 7.5 on my HP 470 G7 Notebook PC, but it doesn't support CentOS 5.5 virtualisation.

So I need to degrade my OS to CentOS 6.7 for example which support CentOS 5.5 virtualisation.

I have desabled Secured Bios and connected an external CD/DVDdrive, and selected first boot on this one.

The system boot on CD/DVD drive with the choice of CentOS 6.7 but it loops and the system degrade doesn't work.

How can I do to realize this depgrade or an hard reset ?.

Thanks for your help

[WAWood]

@mln_83 

Cent OS is a Linux distro and HP does not provide consumer Linux support.

IF you replace the preinstalled Windows OS with a Linux distro, or add a Linux distro, then you assume full responsibility for maintaining that -- including solving any problems with booting the other OS and/or installing the other OS.

Your best bet for support with issues with Linux is to contact the support forum of the distro you are using.

[mln_83]

Thanks for your answer. 

Regards