Whenever i try to upgrade the firmware of my galaxy mini gt-s5570 via samsung kies.....first KIES starts to download the firmware...but the phone doesn't show "downloading" on screen first...but every time (8-9 times that i've tried) when the download reaches around 69%-70%.....the upgrade process halts and says"PC cannot recognize the mobile phone" then the phone gets into download mode and shows "Downloading" on the screen! and i have to reboot my phone! What do i do now? any help??