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 Mk5/Mk4 Downloads

Date Size (bytes) Platform Version Filename Description
2026-07-31 1,007,925 Mk 5.6.0 [current fixed release] 2026-07-31T0518-v5.6.0-mk-coldcard.dfu Latest version for COLDCARD Mk5 and Mk4
2026-07-31 1,122,621 Mk 5.6.0 2026-07-31T0518-v5.6.0-mk-coldcard-factory.dfu Includes BOOTROM needed only by CK factory – reference only.
2026-07-01 1,007,925 Mk 5.5.1 [vulnerable] 2026-07-01T1729-v5.5.1-mk-coldcard.dfu
2026-07-01 1,122,621 Mk 5.5.1 [vulnerable] 2026-07-01T1729-v5.5.1-mk-coldcard-factory.dfu Includes BOOTROM needed only by CK factory – reference only.
2026-03-05 1,003,829 Mk 5.5.0 [vulnerable] 2026-03-05T2052-v5.5.0-mk-coldcard.dfu
2026-03-05 1,118,525 Mk 5.5.0 [vulnerable] 2026-03-05T2052-v5.5.0-mk-coldcard-factory.dfu Includes BOOTROM needed only by CK factory – reference only.