I have a very similar system to yours with the same partitioning scheme and 
formats. What I did was

1. Install the bootloader with: grub-install --target=x86_64-efi 
--efi-directory=/boot --bootloader-id=GRUB
2. then generate the grub config with: grub-mkconfig -o /boot/grub/grub.cfg

Perhaps you can try this from chroot. You need to install grub and efibootmgr 
packages before running the above commands. Mind you, I'm a new Arch user :)

‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐

On Wednesday, January 19th, 2022 at 5:10 AM, Frank Zimmermann via arch-general 
<arch-general@lists.archlinux.org> wrote:

> I'm doing my first Arch install on an UEFI system and have troubles with 
> GRUB. Following the instruction on the Wiki grub-mkconfig complained about a 
> missing /boot/grub/grub.cfg.new.
> 

> So I manually created a grub.cfg file but when rebooting Grub says error: 
> unknown file system. In rescue mode I type
> 

> set root=(hd0,gpt1)
> 

> set prefix=(0,1)/boot/grub
> 

> insmod normal
> 

> error: disk '0,1' not found
> 

> set prefix=(hd0,gpt1)/boot/grub
> 

> insmod normal
> 

> error: unknown filesystem
> 

> set prefix=(0,gpt1)/boot/grub
> 

> insmod normal
> 

> error: disk 0,gpt1 not found
> 

> My efi partition is the first partition on the first ssd.
> 

> I think I did all I found on the Wiki and search on the web but am lost now 
> with generating the grub.cfg
> 

> Any hints please?
> 

> Frank

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