general: - fixed japanese font (ascii code:0xA1) was broken. filer: - fixed wrong keys are drawn in Portguese and German mode, in "delete all", not square key (triangle key is correct). - fixed a bug when UMD is changed in suspend mode, still an old UMD was drawn. - fixed a bug that 0 byte file could not be copied. text viewer: - able to read UTF-8 encoding. - made a help screen. picture viewer: - able to rotate picture by up & down key.