1. Fixing "Unable to load font"

• Every Rockbox theme uses a .fnt file (font) that must be present.
• Themes from the official Rockbox theme site usually mention which font(s) they need.

• You need to install the Fonts package that matches your Rockbox build:

  • Download the Rockbox Extras → Fonts package from the Rockbox website.
  • Unzip it directly into your Rockbox installation (usually /.rockbox/fonts/).
  • Make sure the theme’s .cfg file points to a font that actually exists in /fonts/.

🔎 Example: If the theme says font: myfont.fnt, then /.rockbox/fonts/myfont.fnt must exist. If not, Rockbox throws "unable to load font."

2. Avoiding lag in themes

Rockbox runs on very modest hardware, so themes that are too “fancy” can lag. To minimize:

• Pick lightweight themes: some use complex WPS (While Playing Screen) with big bitmaps that slow things down.
• Use smaller fonts/bitmaps: the larger the images, the more RAM and CPU cycles it eats.
• Avoid album art (if your player is weak): album art slows down scrolling and menus on older models.
• Stick to the right resolution: don’t load themes made for a different screen size; Rockbox will scale and choke.
• Test multiple themes: if one is sluggish, try another — many community themes are optimized for speed.

✅ Quick Fix Checklist:

1. Install the Fonts package.
2. Copy the entire theme folder into /.rockbox/themes/ and any extra bitmaps into /.rockbox/wps/.
3. Apply the theme from Settings → Theme Settings → Browse Themes.
4. If lagging, disable album art and try a simpler theme.