[ovirt-users] Hosted engine can't start after changing cluster settings

I changed the BIOS Type settings in the cluster settings section to UEFI BIOS, and hosted-engine does not start after rebooting. Although, before I made the changes, I looked in the engine at the /boot partition, which has the /efi directory. Is there any way to change the engine settings manually, and how can I connect to it (or to its partitions) to perform actions? I can't imagine how you can reinstall the engine without unplugging storage to import all virtual machines later. Losing data in virtual machines is a disaster for me.