Help! Broken bootloader of Proxmox host

[Garry]

Everyone, good day!

As a result of experiments with the BIOS of the computer on which Proxmox VE 7.1-2 was installed, the bootloader crashed (((
The system does not boot, writes something like "Insert boot media".

PVE was installed on a single 256GB NVMe drive in the standard way (default drive settings, no ZFS).

I booted from a Debian LiveCD flash drive.

Using the fdisk -l command - this disk (dev/nvme0n1) is visible, but without any labels.

I run vgscan and it doesn't show anything.

What to do? How can I restore PVE loading?

 

[Dunuin]

Do you maybe turned on/off raid for your NVMe in BIOS? In such a case a disk would look unpartitioned because the old data can't be recognized anymore.
Or do you maybe changed the boot order or enabled CSM/compability mode so your mainboard is now working in BIOS mode and not UEFI mode and so you can't boot from NVMes anymore?

 

[Garry]

Do you maybe turned on/off raid for your NVMe in BIOS? In such a case a disk would look unpartitioned because the old data can't be recognized anymore.
Or do you maybe changed the boot order or enabled CSM/compability mode so your mainboard is now working in BIOS mode and not UEFI mode and so you can't boot from NVMes anymore?

Mostly I tried with CPU overclocking settings. And maybe with CSM settings (disable legacy)
But I restored defaults settings for BIOS and disks are not recognized yet