I’m setting up a brand-new MK4 and noticed a menu option under Root → Advanced called “Perform Selftest.” When I select it, the device first asks “All on?” and then “All off?”, which seems like a screen test. After that, it displays an animation of an NFC device, and I’m not sure what to do next.
Has anyone here actually used this self-test? How does the device indicate whether the test passes or fails?
There are many YouTube videos about setting up the MK4, yet not a single one mentions this feature. That seems odd for a device aimed at security-conscious users.
The only explanation I’ve found from Coinkite is this: “Perform Selftest: Start the factory self-test which clears the settings, but not the seed. MicroSD card required.”
The MK4 “Perform Selftest” is essentially a factory diagnostic: it runs screen/NFC checks, then verifies hardware using a microSD card. At the end it will show a clear PASS/FAIL message on‑screen — if it passes, the device reboots with settings cleared (but seed intact). If it fails, you’ll see an error code instead. It’s not part of normal setup, just a hardware integrity check.
e-zpassfl 
