hi, dear friends,
i bought my n900 last oct last year, and i forgot my lock code, i send to the outlet where l bought it last wednesday and today i take it back from the outlet, my n900 had re-flash??? but still the lock code cannot be changed

below is photo of my cash receipt when i bought my n900


i just install rootsh from download,,,

i download a.out file of mr. qwerty12 to my laptop and then copy it to Mydocs at my n900 then

i go to xterminal and type sudo gainroot then
/home/user # cp /home/user/MyDocs/a.out /home/user/

below come out
/bin/sh:cp /home/user/MyDocs/a.out /home/user/ : not found

what should i do? kindly help me, tq