How can i hook up my asus Ep121 slate to my smart tv

Most likely you have to hold down the volume up and power button down until you see an icon come up.

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

Here you go.

http://downloadcenter.samsung.com/content/UM/201401/20140125112328617/SM-P900_UM_EU_Kitkat_Eng_D06_140124.pdf

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

Create a new partition, install another instance.

boot to the new instance and set up the administrator password.

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

If it has micro hdmi out then yes but you need to buy a special cable.

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