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can I fix my sprint LG fusic

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okay about 2 weeks ago I went on a water ride with my phone and I got soaked [I dont have to be told how stupid that was cause I know and theres a whole long story behind why I went on anyway] well when I 1st got off it was going crazy just dialing random numbers. then I took the battery out for a little while and when I put it back in it said something about s/w upgrade I dont remember exactly and I couldnt press buttons so I took the battery out and put it back in and didnt turn my phone on and the next morning I turned it on and it said carkit mode. so I took the battery out and put it in and it showed me the upgrade thing then I took out the battery and left it out 4 like 10 mins and it went on and it only goes into car kit when its on charge. I accidemtly took out the battery before and when I put it back in its sawing s/w upgrade then below it says "cannot answeer calls while in s/w upgrade" and th e0852 buttons dont work. and I need those ubuttons lmoao they are in my area code and my picture lock code! is there anyway I can fix this. I cant get a phone till my upgrade in july `09 && I know 4 fact my parents wont buy me one before that