coldcard firmware · Coinkite / Coldcard
Coldcard: firmware update fixes seed generation, but previously created seeds must be replaced
The vendor reports on its channel that the released firmware update fixes seed generation only for future keys. The update does not “repair” a seed created on affected firmware — such a key remains defective, and funds at its addresses are at risk. Restoring from backup or cloning the device does not solve the issue: the defect travels with the key. All owners who generated a seed on vulnerable firmware versions are affected.
Actions to take
Update the firmware to the current version now. If your current seed was created on affected firmware, do more than update: generate a new seed on the device and make an on-chain transfer of funds to new addresses — do not restore from backup or clone. Migration instructions are at the links in the post.