Did you ever try to set "bootdisk" with a hex editor, e.g. HxD.
I'm not sure that I follow exactly what you have done but the BOOTDISK string is being written to different addresses in the two photos you posted?
FAT32 0x1E0
1. Filling the first 100MB of SD card by zeros.
3. Executing EOScard.
And that makes the difference?
To which address (0x1E0 or 0x05C)?
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