ok manage to recover my n900 after this application messed it up.

problem was i could not see any of my application installed, nor could i start anything like terminal.

i manage to start terminal via the hotkey:
ctrl – Shift – X is open x-terminal
then i remove the app as follow
apt-get remove 720prec
and finally removed all traces of app as follow
apt-get purge 720prec
finally rebooted