Hi everyone, I already searched in the Internet an answer to my problem, but unfortunately I have not found a solution for my issue. I even wrote in this case on the official forum, Unfortunately, the moderators could not cope with this problem. Below I describe the problem, hoping that someone had a similar problem and knows the solution. I made an application that works fine on Android 4.1, which is why I reject the problems associated with the lack of "something". For now, it seems that in newer versions of android is a bug, because after updating to Android 4.3+ (API 18+) my app shows the message: My application is an system application, so the file '*.apk' was put in directory '/system/app/' together with a suitable file access permissions (chmod), so that the 'context.getApplicationInfo().flags & ApplicationInfo.FLAG_SYSTEM' is equal 1. Because the application uses the method 'RecoverySystem.installPackage(...)' I added permissions: Code: <uses-permission android:name="android.permission.ACCESS_CACHE_FILESYSTEM" /> <uses-permission android:name="android.permission.REBOOT" /> <uses-permission android:name="android.permission.DELETE_CACHE_FILES" /> <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" /> More than the required minimum, because among others my application uses the method 'RecoverySystem.verifyPackage(...)' Also, this method had problems after updating to Android 4.3+, but these problems have been solved after adding one of (or all) permissions: Code: <uses-permission android:name="android.permission.WRITE_MEDIA_STORAGE"/> <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" /> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" /> NOTE: For testing I added to manifest file also all the possible permissions that are available, but this does not solve the problem. Once again, I would like to emphasize that the application works correctly until an update to android 4.3+. After the update there is an error with the message: This error occurs when call the method 'RecoverySystem.installPackage(...)'. ('FileWriter command = new FileWriter(COMMAND_FILE);' where 'COMMAND_FILE' == '/cache/recovery/command') I'm not sure, but I think that one of the possible reasons may be bug in the 'bootable/recovery/recovery.c', but I can not find any confirmation. If anyone can help, I'd be grateful. P.S. To avoid mess in the Internet, do not post with texts like "use Google", "already it was - I've seen it somewhere - but can not remember where", "I have the same problem / also not working for me", and other posts which do not help solve the problem.