62 D a t a m a n a g e m e n tcertification, the device displays a warning. Continue installation only if youare sure of the origins and contents of the application.Java applications may attempt to, for example, establish a data connection orsend a message. To edit the permissions of an installed Java application and definewhich access point the application will use, select Installed apps., scroll to theapplication, and select Open.After you install applications to a compatible memory card, installation files (.sis) remain inthe device memory. The files may use large amounts of memory and prevent you fromstoring other files. To maintain sufficient memory, use Nokia PC Suite to back up installationfiles to a compatible PC, then use the file manager to remove the installation files from thedevice memory. See ‘File manager,’ p. 62. If the .sis file is a message attachment, delete themessage from the Messaging inbox.Remove an applicationIn the Application manager main view, select Installed apps., scroll to the softwarepackage, and select Options > Uninstall.■ File managerTo browse, open, and manage files and folders in the device memory or on amemory card, select > Applications > Office > File mgr..Back up and restore device memoryTo back up information from device memory to the memory card or restoreinformation from the memory card, in File manager, select Options > Back upphone memory or Restore from mem. card. You can only back up the devicememory and restore it to the same device.Format a memory cardWhen a memory card is formatted, all data on the card is permanently lost. Somememory cards are supplied preformatted and others require formatting.1. In the File manager view, select the memory card.2. Select Options > Memory card options > Format.3. When formatting is complete, enter a name for the memory card.Lock or unlock a memory cardTo set a password to help prevent unauthorised use, in the File manager view,select the memory card and Options > Memory card password > Set. Enter andconfirm your password. The password can be up to eight characters long.