docs: Update USER_GUIDE.md (#817)

Added explanation how to recover from broken config/cache.



### AI Usage

While CrossPoint doesn't have restrictions on AI tools in contributing,
please be transparent about their usage as it
helps set the right context for reviewers.

Did you use AI tools to help write this code? no
This commit is contained in:
Jonas Diemer
2026-02-10 23:23:14 +11:00
committed by GitHub
parent 154ffa0c46
commit 4b2ae7ec7c
+2
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@@ -243,3 +243,5 @@ pio device monitor
```
If the device is stuck in a bootloop, press and release the Reset button. Then, press and hold on to the configured Back button and the Power Button to boot to the Home Screen.
There can be issues with broken cache or config. In this case, delete the `.crosspoint` directory on your SD card (or consider deleting only `settings.bin`, `state.bin`, or `epub_*` cache directories in the `.crosspoint/` folder).