HELP! LG Optimus FRST DONE??? - Optimus 7 General

Hi there!
I tried to update the maps of Navigon Europe of my wife's LG Optimus E900. During the map download the phone shut itself down, tried to boot but after the LG logo appeared, the text "FRST DONE" appeared on the screen and then the whole phone is totally locked (I mean frozen).
Anybody who has run into this kind of problem? The phone is unlocked but I've never ever run into this kind of problem before? Any hints how to get rid of this? Hard reset or any kind of reset at all? I'm capable to dismount the phone if the hardware needs to be touched but all/any hints are appreciated!
Thanks in advance!

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