* Offer rewards to anyone able to send me the fake devices or clues who is making them.
* Tell my clients to upgrade the firmware on devices before use. Make sure every new firmware is distinctive in some way - for example the boot screen, and tell the users to check for that to ensure they are actually running the firmware they thought they just flashed.
All Trezor would need to do is change the compilation options on a fairly regular basis, and any patching will fail.
Combine with the fact there is a reward to send in devices means they can analyze any evil devices and make sure their instructions to users will reliably detect all evil devices they're aware of.
Still doesn't stop supply chain attacks, but makes them far harder.
From their forum earlier this year: https://forum.trezor.io/t/protect-from-getting-a-fake-trezor...
Validate the holograms: Most users aren't forensic experts and don't have an authentic physical sample to compare their evaluation target to, only photos of one.
Only buy from authorized resellers such as the official Amazon shop: Fake products have been introduced into Amazon's supply chain before [1].
The bootloader validates the firmware and displays a warning otherwise: Sure, but so does the fraudsters' bootloader.
[1] https://www.redpoints.com/blog/amazon-commingled-inventory-m...
That said the obvious way to avoid amazon commingling conclusively is to buy it directly from the Trezor shop.
I wonder if Trezor team communicated that in some maybe different way than that line in the CHANGELOG. Not blaming them of course, just wondering.