【AGPTEK】R2S Firmware Upgrade

When there is no card inserted in the player, the display will say “Please insert SD card” when entering the music playing/Recording/E-book/folder interface;
Modified the bug when listening to FM radio, the player will stay in the FM interface instead of searching and re-entering the language selection interface if the memory card is inserted;
Modified the bug when fast forward/rewind, the player will start playing from the point when user stops fast forward/rewind;
Deleted unnecessary information. When removing the memory card, the player will only say “Memory card removed”;
Modified the string when entering now playing interface and there is no music playing in the backend, the player says “No music playing” instead of “File not found”;
Modified UI: shuffle / normal playback; repeat (one, all, off, view playing).