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I don't know whether this is true, but it's definitely possible (there are pin-compatible 64 KiB variants of the MCU). If you use the device without verifying the hardware, it's game over. To prevent Evil Maid attacks, that means checking at EVERY use.https://www.reddit.com/r/ledgerwallet/comments/86b7dk/important_to_everyone_who_bought_a_nano_ledger_s/ …
I don't actually see any 64KiB pin-compatible variants. The only STM32 part with 64K flash and USB in that package is the STM32F302K6 (or K8), which is a completely different series and CPU (F3/Cortex-M4 instead of C0/Cortex-M0) and has a slightly different pinout.
That guy has the original 32K chip, you can still read the F042K66 through the scratches.
I thought I had seen one, but you have a lot more experience in this field so I'm willing to delegate to you on this :)
You never know with manufacturers; I just went through the ST parts picker and couldn't find anything that fit the bill, but if you think you've seen something it's worth taking a look again just in case.
I found the STM32L062K8T6 which is much more similar, clocked slightly slower but not enough to matter. But even the F3 should work if you can get around pinout, mostly differs in clock gating & newer GPIO controller (and you're doing a C level port, not binary patching)
Ah, the low-power series. I was one level too deep into the part picker. The problem with the F3 is the GND pins. F0 uses the exposed pad as GND. If you're lucky either of those F3 GNDs is unused and grounded in the Ledger... but I'd need to look at the PCB.
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