Part 4/8:
Insert your micro SD card into your computer, locate the firmware .dfu file, and save it onto the card. Safely eject the SD card once the transfer is complete.
Upgrading Your Cold Card Firmware
Connecting and Initiating the Update
Power your Cold Card by plugging it into a wall charger via USB—avoid powering from a computer to preserve airgap security.
Insert the prepared micro SD card into your Cold Card with the pins facing upwards.
From the main menu, navigate to Advanced / Tools.
Select Upgrade Firmware.
Choose From SD Card.
The device will recognize the firmware file and prompt for confirmation to begin the upgrade. Confirm when ready.