I have followed all the steps
1.Download super user
3.Copy to root of sdcard (either by inserting micro sd card or through usb)
6.Put into reboot mode (Power + X, when exclmation mark in triangle pops up, hold volume up and camera button)
7.using Dpad, select and click update.zip
-this is where my problem lies-at bottom of screen it says E:Can't open /chache/recovery/command, when I click "apply sdcard:update.zip" it says
E:Can't open /cache/recovery/command
-- Install from sdcard...
Finding update package...
Opening update package...
Verifying update package...
E:failed to open /sdcard/update.zip (no such fil
e or directory)
E:signature verification failed