I have Sony Tablet P at&t android 3.2 but

[zubair8xm]

Hi Guys I tried to Root SOny tab p

My Tab was bricked
then i installed
signed-nbx02_001-installer-01202.009_decrypted

it has android 3.2

I had android 3.2.1

now the problem is i am new to all this and i do not know how to install adb drivers and other stuff.
actually at that time i rooted the tab with kingroot

my tab is working with 3.2 but
the is no option for full screen mode in this
can anybody tell me how to do it

and please can anybody help me how to install 3.2.1 again
because i new to all this and i know nothing about sony tablet p
i searched xda but every thing is so confusing and difficult

can anybody tell me what to do

and also i tried to install from recovery
hack_recovery.zip
custom_prerooted_R1A-nbx02_002.zip

but it showing error

please tell me all method and how to install adb and other stuff

please help