diff --git a/res/values/config.xml b/res/values/config.xml
index d12a000..56ab3c1 100644
--- a/res/values/config.xml
+++ b/res/values/config.xml
@@ -55,4 +55,6 @@
 	</string-array>
 
 	<string name="official_version_tag">NIGHTLY</string>
+
+	<string name="android_version">ro.build.version.release</string>
 </resources>
diff --git a/src/eu/chainfire/opendelta/Config.java b/src/eu/chainfire/opendelta/Config.java
index 4a312c8..d191211 100644
--- a/src/eu/chainfire/opendelta/Config.java
+++ b/src/eu/chainfire/opendelta/Config.java
@@ -67,6 +67,7 @@ public class Config {
     private final String filename_base_prefix;
     private final String url_base_json;
     private final String official_version_tag;
+    private final String android_version;
 
     /*
      * Using reflection voodoo instead calling the hidden class directly, to
@@ -118,9 +119,11 @@ public class Config {
         secure_mode_enable = res.getBoolean(R.bool.secure_mode_enable);
         secure_mode_default = res.getBoolean(R.bool.secure_mode_default);
         url_base_json = res.getString(R.string.url_base_json);
-        filename_base_prefix = String.format(Locale.ENGLISH,
-                res.getString(R.string.filename_base), "");
         official_version_tag = res.getString(R.string.official_version_tag);
+        android_version = getProperty(context,
+                res.getString(R.string.android_version), "");
+        filename_base_prefix = String.format(Locale.ENGLISH,
+                res.getString(R.string.filename_base), android_version);
         boolean keep_screen_on = false;
         try {
             String[] devices = res
diff --git a/src/eu/chainfire/opendelta/UpdateService.java b/src/eu/chainfire/opendelta/UpdateService.java
index 5488c83..dd2d4f7 100644
--- a/src/eu/chainfire/opendelta/UpdateService.java
+++ b/src/eu/chainfire/opendelta/UpdateService.java
@@ -848,7 +848,7 @@ OnWantUpdateCheckListener, OnSharedPreferenceChangeListener {
                     for (int i = 0; i < builds.length(); i++) {
                         JSONObject build = builds.getJSONObject(i);
                         String file = build.getString("filename");
-                        if (file.endsWith(".zip")) {
+                        if (file.endsWith(".zip") && file.startsWith(config.getFileBaseNamePrefix())) {
                             buildNames.add(new File(file).getName());
                         }
                     }
@@ -1818,7 +1818,8 @@ OnWantUpdateCheckListener, OnSharedPreferenceChangeListener {
                     String latestFullBuild = getNewestFullBuild();
                     // if we dont even find a build on dl no sense to continue
                     if (latestFullBuild == null) {
-                        Logger.d("no latest build found at " + config.getUrlBaseJson() + " for " + config.getDevice());
+                        Logger.d("no latest build found at " + config.getUrlBaseJson() +
+                                " for " + config.getDevice() + " prefix " + config.getFileBaseNamePrefix());
                         return;
                     }