I tried many things including complie the font with the tool or use the online converter.
however, when use the font_file.fon on lcd.font() method it reboot the device.
even if the font file is on the board

example: lcd.font("newfont.fon")

I found that only two entries relevant to the topic, one of 4years ago ,which looks still unsolved an one of a few days which has similar issues.

on the other hand the new lcd is the st7789v2, however, almost all the documentation refers to the st7785s which I guess is outdated

Best Regards