Hello good evening, i recently acquired a Samsung Galaxy Fit. Every time i connect it to a computer via USB, the phone only charges and i cannot access the USB mass storage device option. I want to upgrade my galaxy fit and flash a new rom, but i cannot due to the fact that my computer does not recognize my device. i have already tried installing KIAS, as well as samsung mobile drivers, but have had no success. Can anyone please help me, any help is greatly appreciated.

Here are my specs:

Model: GT-S560L
Android version: 2.2.1
Build Number: FROYO.UMKB5
Carrier: TELCEL (mexico)