Did you try checking on your phone if an update is available (apps > settings > about phone > check for updates) ?
When you receive a notification for a system update, tap it, and it should start downloading the update, and guide you through the installation.
i have tried it as you told me.however keeps on telling me no internet settings available.meanwhile, my data connection is enabled and that i can browse with my phone
i forget password my handset acerE310. how is remove password