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 Help by Model

Written by Coinkite Team

Applies to: COLDCARD Q, Mk5, and Mk4

Verified on: July 17, 2026

Choose your model before following a menu path or loading firmware. Q and Mk-series devices share many concepts, but their controls, screens, power options, and firmware files are not interchangeable in every case.

Model help

COLDCARD Q

Read about Q controls, status indicators, power, dual MicroSD slots, QR, NFC, and USB settings.

Open the Q Quickstart

COLDCARD Mk5

Review the current Mk5 overview, hardware changes, controls, and supported workflows.

Open the Mk5 overview

COLDCARD Mk4

Review Mk4 hardware, connections, secure elements, NFC, and MicroSD operation.

Open the Mk4 overview

Dimensions and connectors

Compare current and legacy model size, weight, power, and connector information.

Open COLDCARD Specifications

For firmware, start at COLDCARD Downloads and confirm the model named by the file before installing it.