Firmware
Firmware is the software that runs inside a hardware device such as a hardware wallet, controlling how it generates keys, shows information and signs transactions.
Hardware wallet makers release firmware updates to add features and fix security flaws. An update replaces the code that handles your keys, so it should come only through the maker’s official software and be confirmed on the device.
A legitimate firmware update never asks for the seed phrase to be typed into a computer. Fake update prompts are a common theft technique.
Companion apps and node software have their own updates and advisories. See what to do when a wallet vulnerability is announced.
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