Managers260Important: Only install software from sources that offeradequate protection against viruses and otherharmful software.To increase protection, the application installationsystem uses digital signatures and certificates forapplications. Do not install the application if Applicationmanager gives a security warning during installation.Important: If you install an application that contains anupdate or repair to an existing application, youcan only restore the original application if youhave the original application or a full back-upcopy of the removed application. To restore theoriginal application, first remove the updated orrepaired application and then install again fromthe original application or the back-up copy.During installation, the phone checks the integrity of theapplication to be installed. The phone shows informationabout the checks being carried out and you are givenoptions whether to continue or cancel the installation.Once the phone has checked the integrity of theapplication, it is installed on your phone.Installing applicationsOpen Manager, scroll to an application installationpackage, and select Options → Install to start theinstallation.Alternatively, search the phone’s memory or thememory card, select an application. The installationstarts.