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Would you be able to have that done such that the extra 32KiB is basically "undetectable"? i.e. JTAG and memory map only goes up to 32KiB, but the system bootloader is modified to run hidden code if the "non-hidden" code is signed by Ledger.
Not JTAG, but it should be entirely possible to trojan the bootloader such that it accepts legitimate firmware updates over USB, stores them, but still runs the old modified code (or even dynamically patches the new code, if it hasn't changed much).
This is a very old war to fight (and lose); this kind of thing and similar techniques have been going on for ages with hacked pay TV cards and the like. It's a cat and mouse game. Even with 32K you can always find a way to make some space and hide it.
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