Update docs

INSTALL.txt

@@ -13,7 +13,7 @@ Keys mapping:
 
 Notes:
  - Resolution of games must be 176x220.
- - Sound support if CFW 1.3.3 or later. For older CFW you need update some system files.
+ - Sound support if CFW 1.3.3 or later.
  - You may have to try several versions of a game to find a compatible version.
 
 Installation:
@@ -24,18 +24,4 @@ Installation:
  3. Create folder the main/roms/j2me
     (put jar files here)
 
- 4. Sound will only work if libSDL_mixer-1.2.so.0.12.1 and timidity are installed. 
-    *** Only required for CFW v1.3.2 or earlier ***
-    !!! Can only be done in Linux !!!
-    !!! ONLY DO THIS IF YOU KNOW WHAT YOU ARE DOING !!!
-
-    4a. copy file and update the symlink
-      cd /<mountpoint>/rootfs/usr/lib
-      sudo cp /<files from zip>/libSDL_mixer-1.2.so.0.12.1 .
-      sudo unlink libSDL_mixer-1.2.so.0
-      sudo ln -s libSDL_mixer-1.2.so.0.12.1 libSDL_mixer-1.2.so.0
-
-    4b. Extract the files in timidity.zip to /etc
-     sudo cp /<files from timidity.zip>/timidity.cfg /etc
-     sudo cp -r /<files from timidity.zip>/instruments /etc