Hi i have a iphone which i can install on 1.0.2 i need to do that so i can install a file to make my touchscreen more sensitive, if i leave it on normal i can't type the last row of the keyboard.

Is there a way i can upgrade to 1.1.3 without losing the contact, so i can add a jailbreak and activation and it stays there, or is there any other way so i can access the file system on the phone and add that line again to make my phone touchscreen more sensitive.

Please any advice or help would be great.