diff --git a/Makefile b/Makefile
index dc9a104cce..8d9423ed4a 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,7 @@
 ###########################################################
 
 TARGET=Telmi Story Teller
-VERSION=0.2.3
+VERSION=0.2.4
 
 ###########################################################
 
diff --git a/README.md b/README.md
index cdea74c232..ac4be172b4 100644
--- a/README.md
+++ b/README.md
@@ -2,14 +2,16 @@
 
 # Telmi - An open source story teller and MP3 player for Miyoo Mini
 
-Telmi OS is an open source story teller and MP3 player for Miyoo Mini and Miyoo Mini Plus.
-The story teller is compatible with stories exported from STUdio (v1 format).
+TelmiOS is an open source story teller and lite MP3 player for Miyoo Mini and Miyoo Mini Plus.
+TelmiOS is for children 3~4 years old and older.
+
+The story teller is compatible with stories exported from [STUdio](https://github.com/marian-m12l/studio) (v1 format).
 
 ## Installation
 
 ### Download the installation files
 
-- [Download the latest version of Telmi](https://github.com/DantSu/Telmi-story-teller/releases/download/0.2.3/TelmiOS_v0.2.3.zip)
+- [Download the latest version of Telmi](https://github.com/DantSu/Telmi-story-teller/releases/download/0.2.4/TelmiOS_v0.2.4.zip)
 
 ### Format your SD card as FAT32 (not exFAT!)
 
@@ -44,9 +46,9 @@ Make sure you choose: `For use with all systems and devices (FAT)`
 
 Chrome already has a tool to format an SD card. Insert the card into your Chromebook, right-click it and click **Format Device**, make sure `FAT32` is selected under **Format** and click or tap **Erase & Format**. 
 
-### Unzip TelmiOS_v0.2.3.zip
+### Unzip TelmiOS_v0.2.4.zip
 
-Put the content of `TelmiOS_v0.2.3.zip` at the root of the SD card.
+Put the content of `TelmiOS_v0.2.4.zip` at the root of the SD card.
 
 ### Power on your Miyoo
 
@@ -56,7 +58,7 @@ Insert the SD card in your Miyoo. Press the power button and the installation wi
 
 # Story teller
 
-Export stories from STUdio (v1 format). Unzip stories in `/Stories` folder in micro SD card.
+Export stories from [STUdio](https://github.com/marian-m12l/studio) (v1 format). Unzip stories in `/Stories` folder in micro SD card.
 
 # Music
 
diff --git a/src/bootScreen/bootScreen.c b/src/bootScreen/bootScreen.c
index d7304a728f..6a1be76483 100644
--- a/src/bootScreen/bootScreen.c
+++ b/src/bootScreen/bootScreen.c
@@ -40,12 +40,12 @@ int main(int argc, char *argv[])
 
     if (argc > 1 && strcmp(argv[1], "End") == 0) {
         background = loadImage("Screen_Off");
-    }
-    else if (argc > 1 && strcmp(argv[1], "lowBat") == 0) {
+    } else if (argc > 1 && strcmp(argv[1], "lowBat") == 0) {
         background = loadImage("lowBat");
         show_version = false;
-    }
-    else {
+    } else if (argc > 1 && strcmp(argv[1], "convertingFiles") == 0) {
+        background = loadImage("convertingFiles");
+    } else {
         background = loadImage("bootScreen");
     }
 
diff --git a/src/bootScreen/res/convertingFiles.png b/src/bootScreen/res/convertingFiles.png
new file mode 100644
index 0000000000..59892ace6c
Binary files /dev/null and b/src/bootScreen/res/convertingFiles.png differ
diff --git a/src/storyTeller/sdl_helper.h b/src/storyTeller/sdl_helper.h
index 6eba16f1a4..5eb4c331b8 100644
--- a/src/storyTeller/sdl_helper.h
+++ b/src/storyTeller/sdl_helper.h
@@ -37,7 +37,7 @@ void video_audio_init(void)
     SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO);
     IMG_Init(IMG_INIT_PNG);
     TTF_Init();
-    if(Mix_OpenAudio(44000, 32784, 2, 2048) < 0) {
+    if(Mix_OpenAudio(44100, 32784, 2, 2048) < 0) {
         Mix_Volume(-1, MIX_MAX_VOLUME);
         Mix_VolumeMusic(MIX_MAX_VOLUME);
     }
@@ -62,25 +62,8 @@ void video_audio_quit(void)
     SDL_Quit();
 }
 
-void video_checkFilename(char *filename)
-{
-    int length = strlen(filename);
-    if(strcmp((char *)filename + length - 4, ".jpg") == 0 || strcmp((char *)filename + length - 4, ".JPG") == 0) {
-        filename[length - 3] = 'p';
-        filename[length - 2] = 'n';
-        filename[length - 1] = 'g';
-    } else if (strcmp((char *)filename + length - 5, ".jpeg") == 0 || strcmp((char *)filename + length - 5, ".JPEG") == 0) {
-        filename[length - 4] = 'p';
-        filename[length - 3] = 'n';
-        filename[length - 2] = 'g';
-        filename[length - 1] = '\0';
-    }
-}
-
 void video_displayImage(const char *dir, char *name)
 {
-    video_checkFilename(name);
-    
     char image_path[STR_MAX * 2];
     sprintf(image_path, "%s%s", dir, name);
     SDL_Surface *image = IMG_Load(image_path);
diff --git a/static/build/.tmp_update/runtime.sh b/static/build/.tmp_update/runtime.sh
index 16bc720c98..0c9e5a6d1b 100644
--- a/static/build/.tmp_update/runtime.sh
+++ b/static/build/.tmp_update/runtime.sh
@@ -45,7 +45,7 @@ main() {
     fi
 
     cd $sysdir
-    bootScreen "Boot"
+    bootScreen "convertingFiles"
 
     # Init
     rm /tmp/.offOrder 2> /dev/null
@@ -53,6 +53,7 @@ main() {
     
     storyteller_jpg2png
 
+    bootScreen "Boot"
     # start_networking
     sleep 1
     rm -rf /tmp/is_booting
@@ -69,13 +70,19 @@ storyteller_jpg2png() {
             continue
         fi
 
+        hasconvertedjpg=false
         for file in "$directory"/assets/*.jpg "$directory"/assets/*.jpeg "$directory"/assets/*.JPG "$directory"/assets/*.JPEG; do
             if [ ! -f "$file" ]; then
                 continue
             fi
-            jpg2png "$file" 320 240
+            jpg2png "$file" 480 360
             rm -f "$file" 2> /dev/null
+            hasconvertedjpg=true
         done
+        
+        if $hasconvertedjpg; then
+            sed -i 's/\.\(jpg\|jpeg\)"/\.png"/gI' "$directory"/story.json
+        fi
     done
 }