How to access the motherboard firmware storage via an EFI shell?

I want to better-understand how such software is structured, when deployed to a device.

I own a LINX1010 with an included-by-default EFI shell. It persists when no OS is installed on the internal storage, when an OS entirely clears the internal storage during its installation phase, and when no external storage device (microSD or USB) is connected. Consequently, both it and the motherboard firmware GUI must reside on internal EEPROM.

How can I list, even merely in RO mode, the internal structure of the EFI storage?

Environment

Via map -r, I see BLK1 mount‘d as FS0 (and HD30b, although IDK what that means). It’s merely the EFI partition of the internal storage-installed OS (cpe:/o:fedoraproject:fedora:42), which I can ls though. In comparison, BLK1 isn’t listed, and 2 through 5 are unmounted by default.