iMac7,1: Cannot boot: "cannot open /boot/lua/loader.lua"

**Describe the bug**
I've tried booting helloSystem's installer on a Mid-2007 iMac. It does not boot, saying it can't find /boot/lua/loader.lua (which is, however, present on the USB key I'm using).
I have tried booting with Ventoy, without sucess ("Not a secure boot platform 14"). I have then tried booting helloSystem directly, using both GPT and MBR partition tables, without success either.

**To Reproduce**
Steps to reproduce the behavior:
1. Create a bootable USB key with helloSystem 0.7.0
2. Try to boot it on a 2007 iMac

**Expected behavior**
The system boots.

**Screenshots**

**Version (please complete the following information):**
- Live ISO or installed system to disk: Live
- FreeBSD version (System --> About this Computer): 13?
- helloSystem build (`cat /.url`): 0.7.0 (0G160)
- Running in a virtual machine: no

**Computer (please complete the following information):**
- Device: iMac Mid-2007 (Core 2 Duo 2.0 GHz, more info [here](https://everymac.com/systems/apple/imac/specs/imac-core-2-duo-2.0-20-inch-aluminum-specs.html))