You can try this way:
App Store>Updates>Purchased
- View the apps you deleted
- Find the app which about the same size with NULL app or version that match to the "Null" version
- Download the app again
- Remove it again and delete the cache
Hope it works for you.
Answer from Mark on Stack ExchangeVideos
How to unlock iPhone in null without losing data?
If you want to unlock your iPhone in null without losing data, you can refer to the solution introduced in Part 2. Actually, it is a bit possible to fix the iPhone Security Lockout null error without losing data. After unlocking iPhone in null mode, you can restore your data and settings from a backup.
How to enter iPhone passcode in null?
In fact, it is impossible to enter your iPhone passcode in null. When seeing the support.apple.com/iphone/passcode null error, you can try the above solutions to fix the error. Or you can directly using MagFone iPhone Unlocker to remove the screen passcode soon.
How many attempts before seeing iPhone Security Lock null?
Apple allows users to enter the wrong passcode up to 10 times on the iPhone Lock Screen. After making several attempts to unlock your iPhone with the wrong passcode, you will see an iPhone Unavailable message or a Security Lockout screen. However, when more than 10 attempts are made to enter the wrong passcode, your iPhone will be in Security Lockout null.
In iOS 9, do the following:
- Open Settings > General > Storage & iCloud Usage > Manage Storage
- Select the null app
- Press the button marked Delete App
I have same problem.. i can't find a lot about it on internet. I think its a bug or something. I also had a problem with my iphone. My phone was shutting down after 4 or more hours without using. Only way to turn it on was with a 'hard' reboot. The reboot was necessary for 2 or 3 times en then de phone was working ok for a couple of days. Maybe 'null' has something te do with that? My only solution for now was clean complete iphone with iTunes, put on latest version of iOS (9.0.1) en replace the back-up of most things. For now 'Null' is gone and i hope my shut down problem also.
(Klaas, Holland, iPhone 5s)