Hi MariosX,
You should still be able to get into the recovery mode. Switch the phone off and then turn it back on by holding vol up + Home + power button. If you can reach this part then you can do a factory data reset from the menu however if your phone is missing the boot file to get into the recovery mode then you will need to install it yourself or take your phone to a samsung dealer for repair. See this thread
http://forum.xda-dev...ad.php?t=785201 for info on getting your phone to go into recovery mode.
Hope this helps
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