alma , not sure if this works, but worth a shot.
Using your backup firmware dump file, open it using the S1res tool.
Go to UI30.RES >> mstring
You will see a whole list of text strings. Replace the first selection of each string with your preferred language.
But keep it to the number of characters in each string.
In this screenshot, it is eight characters.
Example for CDELALL, change the
È«²¿É¾³ý to something like
Del All
Do this for every line, and save the new .bin file. Now upload this new file back into your player, go to Setup (or Sys Tool) >> Language >> Simplified Chinese.
Do a time setup again, and see if the problem still occurs.
Try it out and let us know of the result.