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Use only the wallet maker’s official application, verify the device’s own authenticity checks, and never type recovery words into an update screen. A genuine update is normally delivered through the companion app, confirmed on the physical wallet, and accepted only after the device’s bootloader, secure element, or attestation service validates it. An email link, QR code, chat attachment, or unfamiliar download page is not a safe update source.
A normal, correctly verified update does not ask for your recovery phrase, private keys, PIN, or passphrase. If a signature, revision, hash, or genuine-device check fails, stop using the wallet for signing and contact the manufacturer’s official support channel rather than resetting it or installing alternate firmware.
What a firmware-signature check actually proves
Hardware-wallet firmware controls the code that handles your private keys, displays transaction details, and communicates with the companion application. Signature verification is intended to prove that this code was authorized by the manufacturer and has not been altered since release. It does not prove that every application on your computer is safe, that a phishing site is genuine, or that you entered the correct destination address.
Wallet makers use several layers rather than one universal “firmware hash” button:
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- Signed firmware and a bootloader: the device checks a vendor signature before allowing new code to run.
- Application revision and hash checks: the companion app confirms that the installed version is a known release and challenges the device to prove that the expected code is present.
- Secure-element attestation: a protected chip signs a challenge and a vendor service verifies the response and certificate before sensitive firmware operations.
- Physical confirmation: the owner must approve the update on the wallet itself, preventing a computer-only attacker from silently replacing firmware.
These controls are complementary. A public checksum that you copy from a web page is not a substitute for the wallet’s bootloader or secure-channel checks, and a successful download is not evidence that the file is authentic.
Safety rules before you begin
- Identify the exact model and edition shown on the wallet and in its official application. Firmware for one model must not be treated as interchangeable with another.
- Use the manufacturer’s official application, obtained from its official site or signed distribution package. Do not follow update links from email, text messages, letters, QR codes, social-media posts, or chat.
- Never enter recovery words, a private key, PIN, or passphrase to “unlock” a firmware update. BitBox states:
A firmware update never requires recovery words.
- Connect the wallet directly and keep the cable or other connection stable until the application reports completion. Do not close the application, disconnect the device, or let the computer sleep during installation.
- Read the version and release notes before approving the update, then confirm the operation on the physical wallet.
- Treat every revision, signature, hash, or genuine-device error as a stop signal. Do not reset, restore, or install an unofficial build unless official support explicitly directs you.
Safe update procedure
- Record the current state. Open the wallet’s official application and note the displayed model and firmware version. If the device itself displays a version, compare it with the application before continuing.
- Update the companion application first. Obtain the current release from the manufacturer’s official distribution channel. Advanced users may verify a signed installer where the vendor documents that process; for BitBoxApp, GPG verification is complete only when it reports a good signature and the complete official signing-key fingerprint matches.
- Start the update inside the application. Use the application’s built-in firmware prompt. BitBox documents that a normal update is offered inside BitBoxApp and does not require downloading a separate firmware file. Do not browse for a binary simply because a search result offers one.
- Check the release information. Confirm that the model, version, and release notes match your device. Stop if the application proposes firmware for a different model or an unexpected edition.
- Approve on the wallet. Read the device screen and use its required button, touch sensor, or other physical control. A computer-only confirmation is not an adequate substitute.
- Keep the connection intact. Wait through writing, verification, restart, and the application’s completion message. Do not unplug the wallet when its screen appears inactive; an update can be switching bootloader and application modes.
- Verify after restart. Check the firmware version shown by the wallet and official application. If your model supports it, compare the device’s displayed firmware hash with the exact model, edition, and version in the manufacturer’s official release record.
- Test without exposing secrets. Confirm that the application recognizes the device and that accounts and balances are displayed. Never type the recovery phrase into the computer or wallet to “finish” an update. If a recovery operation becomes necessary, first obtain explicit instructions from official support.
How Trezor verifies firmware
Revision and hash checks in Trezor Suite
Trezor Suite performs two distinct checks. The revision check confirms that the firmware version and its RevisionID are known. The hash check challenges the device; Trezor describes it as a mathematical challenge that can be passed only when the official, untampered firmware is present. A version number alone is therefore not enough evidence of authenticity.
Bootloader signatures and physical approval
The bootloader verifies firmware signatures before execution, and an update requires confirmation on the physical wallet. This protects against a computer that tries to install code without the owner’s consent. Trezor documentation warns that installing unsigned firmware can wipe a device, so an unofficial build is not a routine troubleshooting option. If Suite reports a mismatch, it may identify the device as counterfeit or unsafe and restrict functions; stop signing and use official support.
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Developers who need an independent check can reproduce a Trezor build. The documented process is to obtain the official image with trezorctl, zero the model-specific signature bytes, and compare the resulting SHA-256 hash with a local build. Signature offsets differ by model, including Model T, Safe 3, Safe 5, Safe 7, and Trezor One, so an offset from one model must not be reused for another. This is an advanced verification exercise, not a requirement for an ordinary Suite update; the bootloader and Suite checks remain the normal user path.
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How BitBox02 verifies firmware
Signed releases and bootloader acceptance
BitBox releases are signed, and the BitBox02 bootloader verifies the firmware before accepting and starting it. The supported update path is BitBoxApp: the application presents the update, the user confirms it on the device’s touch sensors, and the device remains connected until it restarts and the application reports completion.
Optional startup hash display
Advanced users can enable the startup firmware-hash display and compare the value shown by the device with the matching official release value. The displayed hash is a cryptographic fingerprint of the installed firmware, so the comparison must use the exact model and version. BitBox describes this manual check as optional for most users; disabling the display does not reduce normal security.
The recovery-word rule
BitBox’s explicit safety rule is unambiguous: A firmware update never requires recovery words.
Any page, message, or person asking for those words to complete an update is attempting to divert you from the genuine process. Close it, disconnect only if the application is not actively installing, and contact official support.
How Ledger verifies firmware
Secure-element attestation
Ledger describes a genuine-device attestation chain rather than a workflow in which a typical user downloads a public firmware file and checks a checksum. During a critical firmware action, including every firmware update, the device’s secure element signs a challenge. Ledger’s hardware security module verifies the response and the device certificate through the secure channel used by the official wallet application.
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This means the normal user check is the application’s secure-channel and genuine-device result. It is not equivalent to finding a purported Ledger binary on a third-party site and hashing it. If the genuine check fails, stop the update and use official Ledger support. Ledger notes that if an attacker made a clone running rogue firmware, attestation would fail and the application would reject the device as non-genuine.
Vendor comparison
| Wallet | Normal authenticity method | Root of trust | Physical confirmation | Independent verification information | Failure response |
|---|---|---|---|---|---|
| Trezor | Trezor Suite revision check and device hash challenge, followed by bootloader signature verification | Signed bootloader and official release metadata | Required for updates | Advanced users can reproduce builds with trezorctl, model-specific signature-byte offsets, and SHA-256 comparison |
A mismatch can mark a device counterfeit or unsafe and restrict functions; unsigned firmware can wipe the device |
| BitBox02 | BitBoxApp delivers a signed release; the bootloader verifies it before acceptance and startup | Signed release and bootloader verification | Touch-sensor confirmation required | Optional startup firmware-hash display matched against the exact official release value; signed-app installers can be checked with GPG | Stop if verification fails; do not provide recovery words or install another image |
| Ledger | Official wallet application uses secure-channel genuine-device checks during firmware actions | Secure-element challenge signing, certificate, and Ledger HSM attestation | Follow the device and application prompts | Normal workflow relies on attestation rather than a user-downloaded public binary and checksum | A failed genuine check means the device is rejected as non-genuine; stop and contact official support |
What happens to your recovery phrase during an update?
A legitimate update flow does not display, export, or request the recovery phrase. The phrase is used to restore a wallet, not to authorize ordinary firmware installation. If an update prompt asks you to type words into a web form, desktop dialog, QR-code page, or support chat, treat that prompt as fraudulent.
An update can restart the device and temporarily make accounts unavailable while the application reconnects. That temporary state is different from a reset. Do not choose “wipe,” “reset,” or “restore” merely because an update screen appears unusual. Trezor’s warning about unsigned firmware is important here: an unofficial image can wipe the device, whereas a verified release follows the vendor’s documented update path. If the device ends in an error or recovery screen, preserve the device state and ask official support what to do before entering any secret or approving a reset.
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The connection drops during installation
Do not repeatedly unplug and reconnect at random, and do not install a file found elsewhere. Keep the computer powered, reopen only the official application if its instructions say to do so, and follow its recovery procedure. If the application cannot identify the wallet or reports a failed signature, stop and contact official support with the model, displayed version, and exact error text.
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The displayed hash does not match
First check that you compared the correct model, edition, and firmware version, and that you copied the complete value without changing letter case or characters. If the values still differ, stop signing. A mismatch can indicate altered firmware, an incorrect release record, or a device problem; only the manufacturer can determine which. Do not “fix” it by flashing an unsigned image or resetting the wallet.
The application reports a counterfeit or non-genuine device
Disconnect from third-party instructions and use the manufacturer’s official support channel. Preserve purchase records and screenshots if requested, but never send a recovery phrase, private key, PIN, or passphrase. Trezor’s revision and hash failures and Ledger’s failed attestation are security signals, not prompts to bypass verification.
An update request arrives by email or QR code
Ignore the link and open the already-installed official application yourself, or type the manufacturer’s known official address manually. BitBox specifically warns against downloading firmware from another website or following an update link delivered by email, message, letter, or QR code. The same principle applies to every hardware-wallet brand.
After-update checklist
- Confirm the wallet model and new firmware version on the device and in the official application.
- Confirm that the application’s genuine-device or verification status is successful.
- If supported, record or compare the startup firmware hash for the matching release.
- Check that expected accounts and balances appear without entering recovery words.
- Make a small, separately verified transaction only after the device shows the correct recipient and amount; firmware verification does not replace transaction-screen review.
- Keep the recovery phrase offline. Do not photograph it, paste it into support messages, or store it in a computer file.
When manual verification is worth doing
Most owners should use the official application’s automatic checks and physical confirmation. Manual verification is most useful when you maintain a reproducible-build workflow, operate many devices, or need an auditable release process. In that case, obtain release metadata and signing keys only from the manufacturer’s official publication, verify complete fingerprints rather than shortened key IDs, and document the exact model, version, hash, and tool version used. A manual comparison that omits the model-specific signature bytes, uses a shortened fingerprint, or checks the wrong edition can create false confidence.
The important distinction is between independent reproducibility and ordinary authenticity enforcement. Trezor documents a reproducible-build route; BitBox exposes an optional device hash and signed application verification; Ledger’s normal route is secure-element attestation. None of these methods authorizes downloading firmware from an unknown site.
Bottom line for a safe update
Start and finish in the official wallet application, approve the operation on the physical device, keep it connected until completion, and verify the resulting version or supported hash. Never provide recovery words or other secrets. A failed signature, revision, hash, or genuine-device check is a reason to stop—not a reason to reset or bypass the wallet’s protections.
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