The Coldcard will analyze paths used for change outputs and show a warning if they are not similar in structure to the inputs of that same transaction in the PSBT file.
These are imperfect heuristics and if you receive a false positive, or are doing weird things that don't suit the rules below, please send an example PSBT to support and we'll see if we can handle it better.
The Coldcard (as of v3.0.2) will check:
If your PSBT file does not match this, you will get a "Troublesome Change Outs" warning during the approval process. The expected and actual values observed will be shown on-screen, and you may approve the transaction if you wish.
If the second part of your pin starts with a "2", you might be doing that digit at the phishing words screen. That sends you into the "secondary" PIN, although you are trying to enter the main one. Instead, please be careful to press OK at that screen, then "2".
Maybe you get this warning screen:
0x43587cf might also be
This error means that you are trying to use a Coldcard set for test
net vs. an Electrum that is working on main net (or vice versa).
They need to be set the same. Start Electrum with a
flag and/or change the blockchain on the Coldcard settings to match.
Phantom keypresses have been a problem for some users. Here are some debug steps:
One customer reported this:
I did some testing and it seemed that any computer plugged to the grid is plagued by noise, after connecting the wallet to an offline laptop running on battery power, I had zero issues with the touchpad.
This can happen normally during the upgrade process and isn't a cause for concern, as long as you are one doing the upgrade and have maintained physical possession of the device during the process. You can reset the light to green by 'blessing' the firmware.
The Coldcard FAQ may also have the answer to your question.
If you run into trouble using the Coldcard, please drop a note to firstname.lastname@example.org so we can add your knowledge and experience to this page!
We've found relevant search results.