I have a Sony Ericsson K750i.It says memory stick UNAVAILABLE (phone updated) how do i get mem stick to work?

Memory stick was working fine until I tried to change from 64mb to 512mb, now neither work HELP me please.

Answers:
Test the memory stick in a sony camera to see if it works. If it does it may be your phone. Take it to your provider for help if it isnt the memory stick. Same thing happened to me and they just gave me a whole new phone for free. lol i love being in Germany
http://www.myk750.lasyk.net/

try here there is a forum
It could be the mem stick?.
try to format the sticks in the phone.

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