Jose,
Please dont install firmware or update your player with firmware which is not suitable for your player. The result is usually a 'dead' player and you will have problems with it turning on.
Read these instructions on this post:
http://www.mympxplayer.com/viewtopic.php?p=522#522.
It will tell you how to recover your player so it's working again.
ALWAYS backup your firmware before upgrading it. I hope you did??