[Xperia Arc Android Development] FerhatRemory:
Having this:

---------------------------------------------------------------

Xperia 2011 ICS Easy Rooting toolkit (v1.0)

created by DooMLoRD

"andorid emulator" trick

Credits go to all those involved in making this possible!

---------------------------------------------------------------

[*] This script will:

(1) root ur device using "andorid emulator" trick

(2) install Busybox (1.18.4)

(3) install SU files (ICS specific)

(4) do some checks for free space, tmp directory

(will remove Google Maps if required)

[*] Before u begin:

(1) make sure u have installed adb drivers for ur device

(2) enable "USB DEBUGGING"

from (Menu\Settings\Developer Options\Development)

(3) enable "UNKNOWN SOURCES"

from (Menu\Settings\Security)

(4) [OPTIONAL] increase screen timeout to 10 minutes

(5) connect USB cable to PHONE and then connect to PC

(6) skip "PC Companion Software" prompt on device

---------------------------------------------------------------

CONFIRM ALL THE ABOVE THEN

Press any key to continue . . .

--- STARTING ----

--- WAITING FOR DEVICE

* daemon not running. starting it now *

* daemon started successfully *

--- creating temporary directory

mkdir failed for tmp, File exists

--- cleaning

--- symlinking tmp directory

failed on '/data/local/tmp' - Permission denied

link failed File exists

--- Rebooting

--- WAITING FOR DEVICE TO RECONNECT

--- PLEASE WAIT, THIS MAY TAKE A WHILE

if it gets stuck over here for a long time then try:

disconnect usb cable and reconnect it

toggle "USB DEBUGGING" (first disable it then enable it)

--- DEVICE FOUND

--- enabling emulator hack

/system/bin/sh: cannot create /data/local.prop: Permission denied

--- Rebooting

--- WAITING FOR DEVICE TO RECONNECT

--- PLEASE WAIT, THIS MAY TAKE A WHILE

if it gets stuck over here for a long time then try:

disconnect usb cable and reconnect it

toggle "USB DEBUGGING" (first disable it then enable it)

--- DEVICE FOUND

--- pushing busybox

1889 KB/s (1075144 bytes in 0.555s)

--- correcting permissions

--- remounting /system

mount: permission denied (are you root?)

--- checking free space on /system

26 KB/s (439 bytes in 0.016s)

--- Free space on /system : 66004 bytes

--- no cleanup required

--- copying busybox to /system/xbin/

/system/xbin/busybox: cannot open for write: Read-only file system

--- correcting ownership

Unable to chmod /system/xbin/busybox: No such file or directory

--- correcting permissions

Unable to chmod /system/xbin/busybox: No such file or directory

--- installing busybox

/system/bin/sh: /system/xbin/busybox: not found

--- pushing SU binary

failed to copy 'files\su' to '/system/bin/su': Read-only file system

--- correcting ownership

Unable to chmod /system/bin/su: No such file or directory

--- correcting permissions

Unable to chmod /system/bin/su: No such file or directory

--- correcting symlinks

rm failed for /system/xbin/su, Read-only file system

link failed Read-only file system

--- pushing Superuser app

failed to copy 'files\Superuser.apk' to '/system/app/./Superuser.apk': Read-only

file system

--- cleaning

rm failed for /data/local.prop, No such file or directory

rm failed for /data/local/tmp, Permission denied

failed on '/data/local/tmp.bak' - No such file or directory

--- rebooting

ALL DONE!!!

Press any key to continue . . .