Based on your description, the unit has very similar characteristics to the counterfeit or modified Model T devices that were discovered on Russian marketplaces in 2022–2023.
UnverifiedContext
This is very interesting, and we appreciate the work you have put into investigating the device. Based on your description, the unit has very similar characteristics to the counterfeit or modified Model T devices that were discovered on Russian marketplaces in 2022–2023. The use of a replaced MCU and modified firmware, together with an external microSD card containing legitimate firmware for the integrity check, is a particularly interesting variation on those earlier devices. We would definitely be interested in examining the binary you extracted from the STM32F427.
Evidence
www.gate.com · context
In May 2022, Trezor warned that counterfeit Model T wallets were being sold on a Russian marketplace by an unauthorized seller.
History
- · Unverified · initial