microSD Card Related
On the left side of the COLDCARD® is a microSD card slot. When needed, the COLDCARD will access the files on that card as a means to interact with the rest of the world without using the USB port.
Many features requiring a microSD card are listed in the
MicroSD Card menu, under the Advanced Menu:
Detailed information and instructions are linked in the function description.
Verify Backup - Performs a CRC32 check on your backup file.
Backup System - Encrypts everything you need to regain access to your funds (wallet seed and settings) as a 7z archive and saves it to your microSD card.
Dump Summary - Saves a text file containing a summary of the public details of your wallet. Includes the extended public key (XPUB) for importing to a software wallet.
Export Wallet - Use this option to create data files for various wallets. Allows you to import data while keeping your COLDCARD offline.
Electrum Wallet- Read Using COLDCARD Offline (with Electrum 4.0.3).
Sign Text File - Add a Bitcoin signature to a file already on your microSD card.
Upgrade from SD - Upgrade the COLDCARD's firmware from a
.dfu file saved to a microSD card.
Clone Coldcard - Use this feature to turn an extra, blank COLDCARD into a copy of another COLDCARD.
List Files - Lists the files saved to the microSD card. Selecting a file shows the SHA-256 hash.
Format Card - Formats the inserted microSD card and builds a new file system. Please note, formatting does not create a secure erase of the contents.