Lost phone number on my i pad slate tablet - Tablets & eReaders

http://www.technipages.com/how-to-soft-and-hard-reset-asus-eee-pad-transformer

According to this doc:
EmptyPortlet
http://support.hp.com/us-en/product/HP-Slate-10-HD-Tablet/5447840/model/6617241/document/c04016469/

it should support up to 32 G SDmicro

there is usually a reset button somewhere on the unit, try that

You'll need to do a factory reset:

how do unlock my HP Slate 7 2800 Tablet without password
how do unlock my HP Slate 7 2800 Tablet without password

here is tech support for Your device https://ematic.us/support

The serial number is located on a sticker adhered to the back of the tablet.

You can also find the serial number stored on the tablet. HP Support document

You can add up to 32gb card with the 16gb on board memory

my son charged mine with the car charger for higher voltage charge and its working fine now

The Slate doesn't have any sort of video output. The only thing you may be able to do is run a DLNA server on the device that you can connect to watch videos.

If you're not sure how to setup your Bravia you can find instructions here:
http://www.youtube.com/watch?v=Zt9iPGJFiRs

The steps in this video shows you troubleshooting steps to fix your touchscreen: