diff --git a/source/fs.c b/source/fs.c
index 347bf01..e8adf2c 100644
--- a/source/fs.c
+++ b/source/fs.c
@@ -184,17 +184,8 @@ u32 firmRead(void *dest, u32 firmType)
     //Complete the string with the .app name
     concatenateStrings(path, "/00000000.app");
 
-    //Last digit of the .app
-    u32 i = 42;
-
     //Convert back the .app name from integer to array
-    u32 tempVersion = firmVersion;
-    while(tempVersion)
-    {
-        static const char hexDigits[] = "0123456789ABCDEF";
-        path[i--] = hexDigits[tempVersion & 0xF];
-        tempVersion >>= 4;
-    }
+    hexItoa(firmVersion, &path[35]);
 
     fileRead(dest, path);
 
diff --git a/source/strings.c b/source/strings.c
index adaa712..9d0bb2d 100644
--- a/source/strings.c
+++ b/source/strings.c
@@ -38,4 +38,18 @@ void concatenateStrings(char *destination, const char *source)
         j = strlen(destination);
 
     memcpy(&destination[j], source, i + 1);
+}
+
+void hexItoa(u32 number, char *out)
+{
+    const char hexDigits[] = "0123456789ABCDEF";
+    u32 i = 0;
+
+    while(number > 0)
+    {
+        out[7 - i++] = hexDigits[number & 0xF];
+        number >>= 4;
+    }
+
+    for(; i < 8; i++) out[7 - i] = '0';
 }
\ No newline at end of file
diff --git a/source/strings.h b/source/strings.h
index f6b035f..f6ac599 100644
--- a/source/strings.h
+++ b/source/strings.h
@@ -25,4 +25,5 @@
 #include "types.h"
 
 int strlen(const char *string);
-void concatenateStrings(char *destination, const char *source);
\ No newline at end of file
+void concatenateStrings(char *destination, const char *source);
+void hexItoa(u32 number, char *out);
\ No newline at end of file