Thank you, payment received. Will dispatch tomorrow morning.

Thank you for your acknowledge receipt.

Please find below my answer to your questions:

1). The build in player could not preview picture of the movies. This is nice to have features, most important is the video and audio code.

2). When you press menu button,  to can see ExpressX where you can adjust video setting as below photo :

Your may refer to HD600A Quad Core product catalog as below, the player will be the same as Q5 quad core or Q16 quad core.

http://www.himedia-tech.cn/product_show.php?id=89

The operating system and the CPU of HD600A quad core is totally different form the HD600A. Please do not expect the same player for HD600A and HD600A quad core, only the casing is the same.

The beauty of Android player is capable to install 3rd party player from Googleplay and do not bonded to the hardware manufacturer.  Just search 3rd party player from the GooglePlay if any player meeting your requirement. But I am very confident you will like Himedia native player at the end. As mentioned earlier, the most important of the player is not the cosmetic but the audio and video codec capability.