Hi everybody
Long time ago, after I updated the reader to v.0.47 firmware, I noticed that one of the fonts (the one in Font settings/4.Black, which looked like Times) disappeared. I didn't care too much since I thought it was ugly anyway. I don't know if anybody else also experienced this, but if you did, I managed to recover the font a few days ago. What worked for me was the following:
1. Copy a .ttf font in the root of the SD card and rename it to font5.ttf (it doesn't matter what the font is, the important thing is to have a .ttf font named font5.ttf).
2. Insert the card in the reader and turn it on.
3. Go to Settings/Font settings and press 4.Black. The font should be now recovered.
4. Now you can delete font5.ttf from the SD card.
Note that this procedure results in the recovery of the original font that was installed in the reader before the v.0.47 update; it does not install a new font (that's why it doesn't matter which font is used in the recovery procedure outlined above). Looks like a glitch in the software that can be overcome this way.
This worked for me but, of course, I can't guarantee success, so try this at your own risk.