mac6275

Hi I have samsung Max F679 since 2yrs.My phone restart when i switch on the mobile.I report it to Samsung dealer, they told me that this phone OS software need to be reinstall, some how they didn't install the software into that. Plz suggest me how can i start my mobile and who will help me out to install OS and get handset to working condition. I will be wait for your favourable action. regards, Mayank.