/cache/recovery/command: open failed: EACCES (Permission denied)

I am trying to make a ota updater application, but I think I dont have permission to the command file needed by the recovery. The steps I followed are as below.
My permissions

HTML Code:

---

<uses-sdk android:targetSdkVersion="22" />

    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
    <uses-permission android:name="android.permission.WAKE_LOCK" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <uses-permission android:name="android.permission.VIBRATE" />
    <uses-permission android:name="android.permission.WRITE_SETTINGS" />
    <uses-permission android:name="android.permission.ACCESS_SUPERUSER" />
    <uses-permission
        android:name="android.permission.REBOOT"
        tools:ignore="ProtectedPermissions" />
    <uses-permission android:name="android.permission.RECOVERY" />
    <uses-permission
        android:name="android.permission.ACCESS_CACHE_FILESYSTEM"
        tools:ignore="ProtectedPermissions" />

---

Process:
1. Build apk using eclipse
2. signed it with the platform keys of my custom rom
3. install apk into /system/priv-app

About Rom: CM12 for falcon
About Testing Device: falcon_umts

Can someone please tell where is am going or wrong or what I am missing.

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