### System details

Lenovo ThinkPad T480, i7 variant, not nVidia, 32gb ram, 1tb disk

### What's wrong?

## System details
- Machine: Lenovo ThinkPad T480  
- Firmware: Libreboot (Coreboot fork) — no EFI payload (no UEFI services)  
- Omarchy installer / ISO version: As of yesterday latest v3.3.2 but also tried with older v3.2.X
- Disk/partition layout: mine is /dev/nvme0n1 GPT or it could be /dev/sda MBR for others 

## What happened
The installer finishes successfully (~3.5 minutes) but after the first reboot the system’s bootloader fails to hand off to the OS. The boot stage prints errors (limine or similar) and the machine drops to a prompt or fails to boot. I believe the installer assumed an EFI environment and installed an EFI-mode boot path on firmware that provides no UEFI services.

## Steps to reproduce
1. Use Libreboot/Coreboot without an EFI payload (no UEFI services).  
2. Run the Omarchy installer with default/automatic bootloader options.  
3. Reboot and observe bootloader errors and failed handoff to the installed system.

## Expected behavior
The installer should detect absence of EFI (or detect firmware that doesn’t provide EFI runtime services) and either:
- offer a “Legacy BIOS / No-EFI (Coreboot/Libreboot)” install option in the TUI Installer, or  
- automatically install a BIOS-mode bootloader (GRUB in i386-pc mode, SYSLINUX, or Limine in MBR/BIOS mode) when EFI is not present.

## Why this matters
Some users run Libreboot/Coreboot without an EFI payload (no SeaBIOS/UEFI). The current installer appears to assume UEFI and installs accordingly, causing a complete inability to boot on first reboot. A detection + fallback would prevent breakage for those systems.

## Suggested implementation / detection logic
- Detect EFI presence via simple checks:
  - test -d /sys/firmware/efi  (if absent → no EFI services)  
  - or check efivarfs: mountpoint -q /sys/firmware/efi/efivars  
  - check which boot variables / utilities are available (efibootmgr)  
- If EFI is absent: either prompt user for BIOS-mode install or automatically install a BIOS-mode bootloader and the correct partition layout (BIOS boot partition on GPT or MBR install on MBR disks).

## Recommended installer actions when no EFI detected
- On MBR: install GRUB in BIOS/MBR mode to the disk MBR (grub-install --target=i386-pc /dev/sdX).  
- On GPT: create or use a BIOS Boot Partition (1 MiB, type ef02) and install GRUB BIOS image to that partition.  
- Or provide Limine MBR/BIOS install path (limine-install /dev/sdX) when Limine is preferred.

## Workarounds (manual) — pick one you prefer
A — Install GRUB (BIOS/i386-pc) from a live USB (Arch-style)
```bash
# from live USB
mount /dev/<root-part> /mnt
mount /dev/<boot-part> /mnt/boot    # if separate
arch-chroot /mnt
pacman -S grub
grub-install --target=i386-pc /dev/<disk>     # e.g. /dev/nvme0n1 or /dev/sda
grub-mkconfig -o /boot/grub/grub.cfg
exit
reboot
```

B — Install Limine to MBR (if you prefer Limine)
```bash
# install limine package for your distro, then:
limine-install /dev/<disk>
# ensure /boot/limine.cfg exists and contains kernel/initramfs entries
```
Note: On GPT you may need a BIOS boot partition (1 MiB, type ef02) for GRUB BIOS.

## My results
I tried without success like on other systems cause of the intricacies of Omarchy with disk Encryption. As a person I can go so far.

## Closing words
I hope the Dev team can help our little community out.. We are small but we are there. The ones that don't need Intel ME enabled etc.