The Blackra1n asl.dll is a key file for your copy of iTunes or your iPhone to work properly in your Windows based PC. In case this file is corrupted, one might not be able to access iTunes or their iPhone when it has been connected to the PC. In the case of iTunes, the normal causes for corruption are normally associated with an upgrade of the existing version. When the error pops up when an iPhone is connected, it could be due to the Jail breaking. The best fix is always installing another version of the Blackra1n asl.dll. Simply click here to get the Blackra1n asl.dll.