How do I Unlock for all features and data on the Sylvania Tablet and DVD, #SLTDVD1024

By typing the correct pin or activating a factory reset.

Question edited for a lot more clarity and spelling of maker and model number.
Question moved to a better category.

Ir is a standard Android Operating System, so it will be in settings. Use a smartphone and the Google Translate App to translate what you see on screen.

https://www.google.com/search?q=sylvania+sltdvd1024+change+language

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Information in the link

https://www.google.com/search?q=reset+a+Sylvania+portable+dvd%2Fsmart+tablet

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Contact the manufacturer for advice.

You need the assistance of the manufacturer as there is no way around it for security reasons. It is a password/code and as such is secure.

https://forums.tomsguide.com/threads/how-to-factory-reset-a-sylvania-3-in-1-9-touchscreen-tablet-dvd-player-dvd-combo.173853/

It may also be similar to this?

https://www.androidtablets.net/threads/apply-a-factory-reset-step-by-step-with-images.6437/

The operating system is Android, so it can be done with button presses, or from Settings.
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The screen would have to be replaced and the parts that allow the screen to work would also need to be replaced as well.

The following manual's troubleshooting section refers to a recovery from safe mode on page 16 by repeatedly pressing a button. Sadyly, if this does not work, you might want to consider your warranty.

http://legacy.curtisint.com/html/CustService/Manuals/INSTRUCTION%20MANUAL%20FOR%20SLTDVD1024.pdf
Alternatively:

If you can navigate the screens you can, tap settings,default set, yes.

My guess is that you will have to run a factory restore.
If you have vital important data on the tablet that you cannot loose then you should be thinking about that first.
I recommend you search youtube.com for alternate possible solutions. To backup your data one might be to boot to linux using a usb-pen drive or DVD, Barts Boot disk is another option which may enable booting into WinXP OS to backup your important data before applying a Factory Restore. If this is a laptop (After you have performed the Factory Restore) I encourage you to download a copy of Macrium Reflect and learn how to use it to create a backup of your system. Then if it ever happens again you will be able to restore a previously saved image that is not infected.