After disk decryption, the screen shuts down and the computer reboots

Hi,

I need to revert settings that prevent my system from booting. I can decrypt the hard drive but the screen shuts down when the job “Switch Root” is started. I tried using a live debian USB but after entering the password to decrypt my disk, an error message pops up saying “The operation was canceled”. Is there a way to at least decrypt my hard drive?

Thank you.

Edit: I found this link: GUI Troubleshooting | Qubes OS

Post installation, screen goes black and freezes following LUKS decryption

On the actual installed system, the file to edit is /boot/efi/EFI/qubes/xen.cfg – but it may be hard to access directly when your system won’t boot.

Indeed I don’t know how to access it.

Okay at least I was able to access my encrypted drive by using
cryptsetup luksOpen /dev/mydevice mount_point;
installing lvm2 to mount logical volumes;
activating the logical volumes in group qubes_dom0 with vgchange -ay;
listing the volumes with lvs or lvdisplay and mounting the desired vulumes with the mount command;

Now could someone tell me where I can edit Qube Settings > Devices ?

Edit: I don’t need help anymore. It was quicker to reinstall than to wait for a response.