Installer (and then install) freezes on ThinkCentre M73

Greetings,

I have a Lenovo ThinkCentre M73 (SFF).

I've previously installed Slackware on it and also OpenBSD without any issues.

I use a ventoy-ed USB thumb drive that never gave me any problems (so far). I've also tried using the .iso and the .img raw on another thumb drive, the result is always the same: as soon as the installer shows the image with the boot options and 10s countdown it freezes. I have to hard-reset the PC.


After a brief stint learning about PXE, TFTP, DHCP, NFS i got the PXE version to boot but got the same result: the installer freezes.


This is the thumb drive before dd'ing the FreeBSD iso:
# fdisk -l /dev/sdh
Disk /dev/sdh: 1.89 GiB, 2034237440 bytes, 3973120 sectors
Disk model: DataTraveler 2.0
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: B67560FA-CC19-11F0-17A5-D14FFF7C5968

And this is after:
# fdisk -l /dev/sdh
GPT PMBR size mismatch (2656055 != 3973119) will be corrected by write.
The backup GPT table is corrupt, but the primary appears OK, so that will be used.
The backup GPT table is not on the end of the device.
Disk /dev/sdh: 1.89 GiB, 2034237440 bytes, 3973120 sectors
Disk model: DataTraveler 2.0
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: B67560FA-CC19-11F0-17A5-D14FFF7C5968

Device Start End Sectors Size Type
/dev/sdh1 34 58 25 12.5K FreeBSD boot
/dev/sdh2 80 4175 4096 2M EFI System

Those warnings seem weird, i ran dd if=/path/to/FreeBSD-15.0-RELEASE-amd64-disc1.iso of=/dev/sdh
Eventually i screwed around with BIOS settings some more and got the installer to boot. Yay! Did a mostly next-next-next install and rebooted.
(There was something like "gpt + lenovo fix" in the installer, that was one of the latest changes i tried, it's now been 4-5x i've reinstalled.)

If i boot in UEFI, i get:
Error 1962: No operating system found. Boot sequence will automatically repeat.

If i boot in BIOS, the installer freezes.

Secure Boot is disabled in the BIOS and it boots in "auto" (meaning it supports both UEFI and BIOS).

For reference the board model is 10B4S2DT00. It has a Core i3-4160 CPU, 16 GiB or RAM and a Kingston SV300S37A120G 2.5" 120GB SATA3 SSD.

As for the BIOS, OpenBSD once stated:
bios0 at mainbus0: SMBIOS rev. 2.8 @ 0xebe90 (37 entries)
bios0: vendor LENOVO version "FCKT72AUS" date 08/04/2015
bios0: LENOVO 10B4S2DT00
acpi0 at bios0: ACPI 5.0

Since the installer did boot, i'm assuming something in my BIOS isn't set right, but other than Secure Boot and BIOS/UEFI i can't really think of what.

Any tips in the right direction are highly appreciated!

PS: first post (yes i've read the pinned topics), first try at this OS
 
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