COLDCARD Mk3 firmware update 4.2.0 addresses seed entropy vulnerability. Affected: Mk3 (4.0.1-4.1.9), Mk4/Mk5 (<5.6.0), Q (<1.5.0Q) if <50 private "dice roll" ops during seed gen. Action: 1. Update firmware to latest. 2. Generate NEW seed. 3. Migrate funds CAUTIOUSLY. This is CRITICAL for fund security. Act promptly! #coldcard #security #bitcoin #firmware