Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Returned two players.

Had to return two players. I went to Samsung website to check if there were any firmware updates available for the YP-MT6X player and there were two; one version was 1.101 and the other 2.121. So, I installed the software provided by Samsung to upgrade the firmware to version 2.121 (downloaded from Samsung website). I plugged the player and started the update process. Everything seemed to be ok. When I unplugged the USB cable the player would no longer turn on. I had the same exact problem with the second player. I contacted Samsung customer support, they were of no use; I was told to send the player to them for service. If you buy this player, DO NOT UPGRADE FIRMWARE to version 2.121 or you will have problems.