COLDCARD Security Advisory A seed-generation defect affected releases beginning with firmware 4.0.1. Fixed firmware is available. Existing affected seeds still require migration. Check status
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COLDCARD Firmware Help

Written by Coinkite Team

Applies to: COLDCARD Q, Mk5, and Mk4

Verified on: July 17, 2026

Use only an official firmware file intended for your model. Verify the downloaded file and release signature before loading it, then follow the current menu path in the upgrade documentation.

Firmware routes

Download firmware

Get current and historical release files from the official COLDCARD download service.

Open Downloads

Verify and install

Check the SHA-256 hash and signed release information, then follow the current MicroSD or supported upgrade path.

Open Upgrade Firmware

Read release history

Review changes, fixes, model scope, and version history before deciding whether to update.

Open Version History

Check device status

Review the GENUINE/CAUTION indicators and other hardware checks used before PIN entry and after an upgrade.

Open Hardware Features

Do not infer compatibility from a similar filename. Confirm the model and release family shown by the official Downloads page and upgrade guide.