This won't work with your PRS-T1.
There is a special rescue image that can be put on SD card and booted from. It will give you a linux root shell over USB serial connection as well as access to internal flash memory via USB gadget driver.
Download rupor-rescue.7z from here:
http://translate.google.com/translat...hp%3Ft%3D23354
Unzip into root folder of fat formated sd card and boot up the reader while keeping home+menu pressed until progress bar becomes 100%.
Now, you can connect to computer via USB and start messing around
I would try a manual factory reset first:
https://wiki.mobileread.com/wiki/PRST...#Factory_Reset