Hello, Michael -
Without knowing the model of your Sylvania DVD player, it is difficult to provide you with specific directions on what you can try. Also, it would help in knowing what region your DVD is currently set to.
First, I suggest you read this article:
Then, this is the link to the website VideoHelp.com mentioned in the article:
Then, you will want to click or tap on the link for DVD Hacks at the top of the window.
After that, you are on your own since I do not know the model number of your Sylvania DVD player.
Note: If you wish to post a question on VideoHelp.com, you will need to register - free - through the home page (upper right corner.)