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.
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Context
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. If you are able to share it with us, please send it over.
Evidence
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History
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