Firstly, if you cant get into the Engineeres menu, boot up 2321 instead of 4321 then you should be able to get into the EM straight after it starts to boot up again ok?
Then you should check in the EM for the signal quality and net id etc,
If thats all ok then take the card out and boot it up.
Make sure to check the signal quality for more than a few seconds because if its a cap' fault it might not show for a min or two, then it will all go off and thats why the update dont work ok.
Clive.