- 2018-08-07T1530-v1.0.0r2-coldcard.dfu built Aug 7th, 2018.
Older releases, the source code, and much more be found in our repository on github.
The upgrade menu allows your to load updated firmware onto the Coldcard.
The menu allows loading a upgrade file from a MicroSD card, but it can also be done using the command line tool, or from the Electrum plugin.
- Show Version
- Displays the version numbers that you have already.
- From MicroSD
- Select an upgrade file from MicroSD card and start the process.
- Bless Firmware
- Mark the contents of flash memory as "approved" and light the green "Genuine" light.
You need a
DFU file for upgrades. It's about 690k in size and should have the
The latest firmware will always be available in Github:
All upgrade files must be signed by a Coinkite Inc approved key.
In general, it may not be possible to downgrade (return to an older release). Some releases will set a "high water mark" so the bootloader that will block any downgrade to earlier versions. We will do this if a bug or security problem with an obsolete release is identifed.