Hi fsportugal,
Welcome to the site.
Unfortunately due to the large variation in manufacturers changing the firmware to match their player, not all 9.1.52 will work on your player. Actual fact, you'll have a higher risk of having a DEAD PLAYER than getting a firmware that will work on your player just based on the firmware version.
Is there anything wrong with your player? If, not I would say leave it as it is and don't try to put another firmware on it. You only need to see the "DEAD PLAYERS" section of the forums to see what I mean. You don't want to go through the whole process of recovering a dead player by using an incompatible firmware on your player.
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