This firmware has no published screen capture. Some diagnostics primarily report through USB serial. Screen appearance remains unverified here; see its app README for the intended behavior.
What to expect
Lists files from the FNK0104B four-bit SDIO card over serial without formatting it. Use its application guide for controls, prerequisites and recorded device checks.
Capabilities used
Install and inspect
Install SD card diagnostic over USB ↗
pio run -e sd
pio device list
pio run -e sd -t upload --upload-port <port>
pio device monitor --port <port> -b 115200Replace <port> with the discovered device. Build before upload. Read the app's partition and storage notes before switching firmware.
Evidence and controls
Read the application guide and its verification record ↗
Implementation, a passing build, observed serial operation and physical interaction are separate evidence levels. Check the guide's open device checks before relying on an unmeasured behavior.